50278 + Interview Questions in Physics

1.	comnsider A,B,C to be co-centric shells of metal.their radii are a,b,c respectively.(a
Answer» comnsider A,B,C to be co-centric shells of metal.their radii are a,b,c respectively.(a

Discussion

2.	6.A thin uniform rod of length and mass m is swinging freely about a horizontal axis passing through its end. lts maximum angular speed is w. Its centre of mass rises to a maximum height of:-
Answer» 6.A thin uniform rod of length and mass m is swinging freely about a horizontal axis passing through its end. lts maximum angular speed is w. Its centre of mass rises to a maximum height of:-

Discussion

3.	An iron rod of volume 10−3 m3 an drelative permiability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic of the rod will be nearly
Answer» An iron rod of volume $10^{- 3} m^{3}$ an drelative permiability $1000$ is placed as core in a solenoid with $10 turns/cm$ . If a current of $0.5 A$ is passed through the solenoid, then the magnetic of the rod will be nearly

Discussion

4.	Current flowing in a long solenoid with the radius R (of cross section) is varied, so that magnetic field inside the solenoid varies with time according to the law, B=αt2. Induced electric field as a function of distance (r) from the solenoid axis, is
Answer» Current flowing in a long solenoid with the radius $R$ (of cross section) is varied, so that magnetic field inside the solenoid varies with time according to the law, $B = α t^{2} .$ Induced electric field as a function of distance $(r)$ from the solenoid axis, is

Discussion

5.	how to convert V(volt) into eV
Answer» how to convert V(volt) into eV

Discussion

6.	When 4Be9 atom is bombarded with α− particles, one of the products of nuclear transmutation is 6C12 .
Answer» When $_{4} B e^{9}$ atom is bombarded with $α -$ particles, one of the products of nuclear transmutation is $_{6} C^{12}$ .

Discussion

7.	A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ mo of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). boy recalls the relation almost correctly but forgets where to put the constant c. He writes : m = mₒ / (1 - υ ²) ⅟² Guess where to put the missing c.
Answer» A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ mo of a particle in terms of its speed v and the speed of light, c. (This relation first arose as a consequence of special relativity due to Albert Einstein). boy recalls the relation almost correctly but forgets where to put the constant c. He writes : m = mₒ / (1 - υ ²) ⅟² Guess where to put the missing c.

Discussion

8.	Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2 (g = 10 m/s2). Then
Answer» Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2 (g = 10 m/s²). Then

8.

Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2 (g = 10 m/s2). Then

Answer»

Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2 (g = 10 m/s²). Then

Discussion

9.	Two thin wires each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and-q. The potential difference between the centres of the two ring is
Answer» Two thin wires each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and-q. The potential difference between the centres of the two ring is

Discussion

10.	The energy required to launch a satellite from surface of the planet of mass m and radius r into circular orbit of radiyus 2r
Answer» The energy required to launch a satellite from surface of the planet of mass m and radius r into circular orbit of radiyus 2r

Discussion

11.	A man starts walking from the point P(−3,4), touches the x− axis at R, and then turns to reach at the point Q(0,2). The man is walking at a constant speed. If the man reaches the point Q in the minimum time, then 50(PR)2+(RQ)2 is equal to
Answer» A man starts walking from the point $P (- 3, 4),$ touches the $x -$ axis at $R,$ and then turns to reach at the point $Q (0, 2) .$ The man is walking at a constant speed. If the man reaches the point $Q$ in the minimum time, then $50 (P R)^{2} + (R Q)^{2}$ is equal to

Discussion

12.	A ball whose density is 0.4×103mg/m3 falls into water from a height of 9cm. To what depth does the ball sink?
Answer» A ball whose density is $0.4 \times 10^{3} m g / m^{3}$ falls into water from a height of 9cm. To what depth does the ball sink?

Discussion

13.	Incident ray is defined as:
Answer» Incident ray is defined as:

Discussion

14.	ntIntegrate with respect to x;n nt1/(x-4)n
Answer» ntIntegrate with respect to x;n nt1/(x-4)n

Discussion

15.	Ball has more inertia than a piece of paper. Then why does ball fall first than the paper when thrown from a height
Answer» Ball has more inertia than a piece of paper. Then why does ball fall first than the paper when thrown from a height

Discussion

16.	Two blocks each of mass M are connected to the ends of a light frame as shown in below figure. The frame is rotated about the vertical line of symmetry. The rod breaks if the tension in it exceeds T0. Find the maximum frequency with which the frame may be rotated without breaking the rod.
Answer» Two blocks each of mass M are connected to the ends of a light frame as shown in below figure. The frame is rotated about the vertical line of symmetry. The rod breaks if the tension in it exceeds $T_{0}$ . Find the maximum frequency with which the frame may be rotated without breaking the rod.

16.

Two blocks each of mass M are connected to the ends of a light frame as shown in below figure. The frame is rotated about the vertical line of symmetry. The rod breaks if the tension in it exceeds T0. Find the maximum frequency with which the frame may be rotated without breaking the rod.

Answer»

Two blocks each of mass M are connected to the ends of a light frame as shown in below figure. The frame is rotated about the vertical line of symmetry. The rod breaks if the tension in it exceeds $T_{0}$ . Find the maximum frequency with which the frame may be rotated without breaking the rod.

Discussion

17.	Time period of a particle executing SHM is 8 sec . At t=0it is at mean position . The ratio of dis†an ce covered by the particle in 1^{st } second to the 2^{nd }second
Answer» Time period of a particle executing SHM is 8 sec . At t=0it is at mean position . The ratio of dis†an ce covered by the particle in 1^{st } second to the 2^{nd }second

Discussion

18.	Two circular loops of same radii, R=1 m carrying same current, I=1 A as shown in the figure. The effective distance between the centres of the loop is, x=√3 m. Find the net magnetic field at point P.
Answer» Two circular loops of same radii, $R = 1 m$ carrying same current, $I = 1 A$ as shown in the figure. The effective distance between the centres of the loop is, $x = \sqrt{3} m$ . Find the net magnetic field at point $P$ .

Discussion

19.	A soap bubble of diameter 10 mm has an excess pressure of 50 N/m2. Find the surface tension of soap solution.
Answer» A soap bubble of diameter $10 mm$ has an excess pressure of $50 {N/m}^{2}$ . Find the surface tension of soap solution.

Discussion

20.	Why unit of pole strength is Am?
Answer» Why unit of pole strength is Am?

Discussion

21.	1.A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)
Answer» 1.A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)

Discussion

22.	Three resis†an ces A, B and C have values 3R, 6R and R respectively. When some potential difference is applied across the network the thermal powers dissipated by A, B and C are in the ratio-(given that A and are connected in parallel and C in series with the combination of A and B) (i)2:3:4 (ii)2:4:3 (iii)4:2:3 (iv)3:2:
Answer» Three resis†an ces A, B and C have values 3R, 6R and R respectively. When some potential difference is applied across the network the thermal powers dissipated by A, B and C are in the ratio-(given that A and are connected in parallel and C in series with the combination of A and B) (i)2:3:4 (ii)2:4:3 (iii)4:2:3 (iv)3:2:

Discussion

23.	Two stones A and B are projected simultaneously as shown in figure. It has been observed that both the stones reach the ground at the same place after 7 seconds of their projection. The difference in the vertical components of their initial velocities in m/s is (g=9.8 m/s2)
Answer» Two stones A and B are projected simultaneously as shown in figure. It has been observed that both the stones reach the ground at the same place after $7$ seconds of their projection. The difference in the vertical components of their initial velocities in $m/s$ is ( $g = 9.8 {m/s}^{2}$ )

Discussion

24.	Two magnetic dipoles (short) are given as shown in figure. The force of interaction between them is
Answer» Two magnetic dipoles (short) are given as shown in figure. The force of interaction between them is

Discussion

25.	If a>3 and A,B,C are variable angles of △ABC, such that √2a2−9cotA+2acotB+√2a2+9cotC=12a, then the minimum value of cot2A+cot2B+cot2C=
Answer» If $a > 3$ and $A, B, C$ are variable angles of $△ A B C,$ such that $\sqrt{2 a^{2} - 9} cot A + 2 a cot B + \sqrt{2 a^{2} + 9} cot C = 12 a,$ then the minimum value of ${cot}^{2} A + {cot}^{2} B + {cot}^{2} C =$

Discussion

26.	An inclined plane is bent in such a way that the vertical cross-section is given by y=x24 where y is in vertical and x is in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction μ=0.5, the maximum height in cm at which a stationary block will not slip downward is _____ cm.
Answer» An inclined plane is bent in such a way that the vertical cross-section is given by $y = \frac{x^{2}}{4}$ where $y$ is in vertical and $x$ is in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction $μ = 0.5$ , the maximum height in $cm$ at which a stationary block will not slip downward is _____ $cm$ .

Discussion

27.	A vernier callipers has 25 divisions on its vernier scale for every 35 divisions on its main scale. If 1 cm on the main scale is split into 12 units, the least count of the callipers will be
Answer» A vernier callipers has 25 divisions on its vernier scale for every 35 divisions on its main scale. If 1 cm on the main scale is split into 12 units, the least count of the callipers will be

Discussion

28.	The domain of f(x)=√(–logsinxtan2x) in x∈[0,π] is
Answer» The domain of $f (x) = \sqrt{(- {log}_{sin x} tan 2 x)}$ in $x \in [0, π]$ is

Discussion

29.	In the figure shown, a block A moving with velocity 20 m/s on a horizontal surface collides with another identical block B, initially at rest. The coefficient of restitution is 0.5. Neglect friction everywhere. The distance between the blocks, 5 sec after the collision takes place is
Answer» In the figure shown, a block $A$ moving with velocity $20 m/s$ on a horizontal surface collides with another identical block $B$ , initially at rest. The coefficient of restitution is $0.5$ . Neglect friction everywhere. The distance between the blocks, $5 sec$ after the collision takes place is

Discussion

30.	If the mass of the moon is M81, where M is the mass of the earth, find the distance of the point where the gravitational field due to earth and moon cancel each other, from the centre of the moon. Given that the distance between the centres of the earth and moon is 60R where R is the radius of earth.
Answer» If the mass of the moon is $\frac{M}{81}$ , where $M$ is the mass of the earth, find the distance of the point where the gravitational field due to earth and moon cancel each other, from the centre of the moon. Given that the distance between the centres of the earth and moon is $60 R$ where $R$ is the radius of earth.

Discussion

31.	Find θ if the light is falling on the pole of the spherical mirror.
Answer» Find $θ$ if the light is falling on the pole of the spherical mirror.

Discussion

32.	40. Electric potential difference between two parallel conducting sheets with unlike surface charge { density of magnitude σ, is (separation between the { sheets is d )
Answer» 40. Electric potential difference between two parallel conducting sheets with unlike surface charge { density of magnitude σ, is (separation between the { sheets is d )

Discussion

33.	Two identical discs of the same radius R are rotating about their axes in opposite directions with the same constant angular speed ω. The discs are in the same horizontal plane. At time t = 0, the points P and Q are facing each other as shown in the figure. The relative speed between the two points P and Q is vr. In one time period (T) of rotation of the discs, vr as a function of time is best represented by
Answer» Two identical discs of the same radius R are rotating about their axes in opposite directions with the same constant angular speed $ω .$ The discs are in the same horizontal plane. At time t = 0, the points P and Q are facing each other as shown in the figure. The relative speed between the two points P and Q is $v_{r}$ . In one time period (T) of rotation of the discs, $v_{r}$ as a function of time is best represented by

Discussion

34.	The instantaneous angular position of a particle undergoing a circular motion is given by the equation θ(t)=4t3−3t2. Find the time when the angular acceleration of the particle becomes zero.
Answer» The instantaneous angular position of a particle undergoing a circular motion is given by the equation $θ (t) = 4 t^{3} - 3 t^{2}$ . Find the time when the angular acceleration of the particle becomes zero.

Discussion

35.	Why was the crofter so talkative and friendly with the peddler?
Answer» Why was the crofter so talkative and friendly with the peddler?

Discussion

36.	If wavelengths 4500 ˚A and 6000 ˚A are found to be missing in the reflected spectrum in thin air film interference, the thickness of the film for normal incidence is nearly
Answer» If wavelengths $4500 ˚ A$ and $6000 ˚ A$ are found to be missing in the reflected spectrum in thin air film interference, the thickness of the film for normal incidence is nearly

Discussion

37.	The amount of liquid flowing per second in the tubes (1),(2) and (3) are 10 m3/s,5 m3/s and 8 m3/s respectively. The velocity of liquid in the tube (4) having cross - section of 0.5 m2 is
Answer» The amount of liquid flowing per second in the tubes $(1), (2)$ and $(3)$ are $10 m^{3} / s, 5 m^{3} / s$ and $8 m^{3} / s$ respectively. The velocity of liquid in the tube $(4)$ having cross - section of $0.5 m^{2}$ is

Discussion

38.	a body executes SHM with an amplitude A . at what displacement from the mean position is the potential energy of the body one -fourth of its total energy
Answer» a body executes SHM with an amplitude A . at what displacement from the mean position is the potential energy of the body one -fourth of its total energy

Discussion

39.	A circular shaft of diameter d resists the maximum shear stress τ caused by torque T. If the same torque is applied to a shaft having diameter 2d and length half the length of shaft of diameter d, the maximum shear stress developed in shaft (having diameter 2d) is:
Answer» A circular shaft of diameter d resists the maximum shear stress $τ$ caused by torque T. If the same torque is applied to a shaft having diameter 2d and length half the length of shaft of diameter d, the maximum shear stress developed in shaft (having diameter 2d) is:

Discussion

40.	A series RLC circuit has inductance of 0.12 H, capacitance of 480 nF and resistance of 23 Ω is connected to a 230 V AC supply whose frequency can be varied. What is the source frequency for which average power absorbed by the circuit is maximum? Also, find the value of maximum power.
Answer» A series $R L C$ circuit has inductance of $0.12 H$ , capacitance of $480 nF$ and resistance of $23 Ω$ is connected to a $230 V$ AC supply whose frequency can be varied. What is the source frequency for which average power absorbed by the circuit is maximum? Also, find the value of maximum power.

Discussion

41.	Determine the relationship that governs the velocities of four cylinders if vA, vB, vC and vD represents velocities of block A, B, C and D. Consider downward velocity as positive and strings inextensible.
Answer» Determine the relationship that governs the velocities of four cylinders if $v_{A}$ , $v_{B}$ , $v_{C}$ and $v_{D}$ represents velocities of block A, B, C and D. Consider downward velocity as positive and strings inextensible.

Discussion

42.	A nucleus of mass number A, originally at rest, emits an α-particle with speed v. The daughter nucleus recoils with a speed
Answer» A nucleus of mass number $A$ , originally at rest, emits an α-particle with speed $v$ . The daughter nucleus recoils with a speed

Discussion

43.	In a Millikan's oil drop experiment , an oil drop of mass 0.64×10−14 kg carrying a charge 1.6×10−19 C remains stationary between two plates separated by a distance of 5 mm. The voltage that must be applied between the plates is-[Take g=9.8 ms−2 ]
Answer» In a Millikan's oil drop experiment , an oil drop of mass $0.64 \times 10^{- 14} kg$ carrying a charge $1.6 \times 10^{- 19} C$ remains stationary between two plates separated by a distance of $5 mm .$ The voltage that must be applied between the plates is- [Take $g = 9.8 {ms}^{- 2}$ ]

Discussion

44.	28. A staircase contains three steps having height 10 cm each . If each are 20 cm wide then the the minimum horizontal velocity of a ball moving off plane so as to hit the lowest plane directly is
Answer» 28. A staircase contains three steps having height 10 cm each . If each are 20 cm wide then the the minimum horizontal velocity of a ball moving off plane so as to hit the lowest plane directly is

Discussion

45.	What is torque??What is Plank's Constant??
Answer» What is torque?? What is Plank's Constant??

Discussion

46.	In the given network, C1=10μF, C2=5μF and C3=4μF. What is the resultant capacitance between A and B?
Answer» In the given network, $C_{1} = 10 μ F, C_{2} = 5 μ F$ and $C_{3} = 4 μ F .$ What is the resultant capacitance between $A$ and $B$ ?

Discussion

47.	In a Van de Graaff type generator a spherical metal shell is to be a15 × 106 V electrode. The dielectric strength of the gas surroundingthe electrode is 5 × 107 Vm–1. What is the minimum radius of thespherical shell required? (You will learn from this exercise why onecannot build an electrostatic generator using a very small shellwhich requires a small charge to acquire a high potential.)
Answer» In a Van de Graaff type generator a spherical metal shell is to be a15 × 106 V electrode. The dielectric strength of the gas surroundingthe electrode is 5 × 107 Vm–1. What is the minimum radius of thespherical shell required? (You will learn from this exercise why onecannot build an electrostatic generator using a very small shellwhich requires a small charge to acquire a high potential.)

Discussion

48.	The bulk modulus of a sphere is ′K′. If it is subjected to uniform pressure ′p′ then fractional decrease in its radius is
Answer» The bulk modulus of a sphere is $^{'} K^{'}$ . If it is subjected to uniform pressure $^{'} p^{'}$ then fractional decrease in its radius is

Discussion

49.	Explain the working of electric motor
Answer» Explain the working of electric motor

Discussion

50.	The output sequence y[n] and the pulse response h[n] of a discrete system are given by,y[n]={1↑,1,2,−1,3}h[n]={1↑,2,3}The input sequence x[n] is
Answer» The output sequence y[n] and the pulse response h[n] of a discrete system are given by, $y [n] = {1 ↑, 1, 2, - 1, 3}$ $h [n] = {1 ↑, 2, 3}$ The input sequence x[n] is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

comnsider A,B,C to be co-centric shells of metal.their radii are a,b,c respectively.(a

6.A thin uniform rod of length and mass m is swinging freely about a horizontal axis passing through its end. lts maximum angular speed is w. Its centre of mass rises to a maximum height of:-

An iron rod of volume 10−3 m3 an drelative permiability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic of the rod will be nearly

Current flowing in a long solenoid with the radius R (of cross section) is varied, so that magnetic field inside the solenoid varies with time according to the law, B=αt2. Induced electric field as a function of distance (r) from the solenoid axis, is

how to convert V(volt) into eV

When 4Be9 atom is bombarded with α− particles, one of the products of nuclear transmutation is 6C12 .

Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2 (g = 10 m/s2). Then

Two thin wires each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and-q. The potential difference between the centres of the two ring is

The energy required to launch a satellite from surface of the planet of mass m and radius r into circular orbit of radiyus 2r

A man starts walking from the point P(−3,4), touches the x− axis at R, and then turns to reach at the point Q(0,2). The man is walking at a constant speed. If the man reaches the point Q in the minimum time, then 50(PR)2+(RQ)2 is equal to

A ball whose density is 0.4×103mg/m3 falls into water from a height of 9cm. To what depth does the ball sink?

Incident ray is defined as:

ntIntegrate with respect to x;n nt1/(x-4)n

Ball has more inertia than a piece of paper. Then why does ball fall first than the paper when thrown from a height

Two blocks each of mass M are connected to the ends of a light frame as shown in below figure. The frame is rotated about the vertical line of symmetry. The rod breaks if the tension in it exceeds T0. Find the maximum frequency with which the frame may be rotated without breaking the rod.

Time period of a particle executing SHM is 8 sec . At t=0it is at mean position . The ratio of dis†an ce covered by the particle in 1^{st } second to the 2^{nd }second

Two circular loops of same radii, R=1 m carrying same current, I=1 A as shown in the figure. The effective distance between the centres of the loop is, x=√3 m. Find the net magnetic field at point P.

A soap bubble of diameter 10 mm has an excess pressure of 50 N/m2. Find the surface tension of soap solution.

Why unit of pole strength is Am?

1.A sound wave of frequency 330 hertz is incident normally at reflected wall then minimum distance from wall at which particle vibrate very much? (velocity sound is 330 metre per second)

Two stones A and B are projected simultaneously as shown in figure. It has been observed that both the stones reach the ground at the same place after 7 seconds of their projection. The difference in the vertical components of their initial velocities in m/s is (g=9.8 m/s2)

Two magnetic dipoles (short) are given as shown in figure. The force of interaction between them is

If a&gt;3 and A,B,C are variable angles of △ABC, such that √2a2−9cotA+2acotB+√2a2+9cotC=12a, then the minimum value of cot2A+cot2B+cot2C=

A vernier callipers has 25 divisions on its vernier scale for every 35 divisions on its main scale. If 1 cm on the main scale is split into 12 units, the least count of the callipers will be

The domain of f(x)=√(–logsinxtan2x) in x∈[0,π] is

In the figure shown, a block A moving with velocity 20 m/s on a horizontal surface collides with another identical block B, initially at rest. The coefficient of restitution is 0.5. Neglect friction everywhere. The distance between the blocks, 5 sec after the collision takes place is

Find θ if the light is falling on the pole of the spherical mirror.

40. Electric potential difference between two parallel conducting sheets with unlike surface charge { density of magnitude σ, is (separation between the { sheets is d )

The instantaneous angular position of a particle undergoing a circular motion is given by the equation θ(t)=4t3−3t2. Find the time when the angular acceleration of the particle becomes zero.

Why was the crofter so talkative and friendly with the peddler?

If wavelengths 4500 ˚A and 6000 ˚A are found to be missing in the reflected spectrum in thin air film interference, the thickness of the film for normal incidence is nearly

The amount of liquid flowing per second in the tubes (1),(2) and (3) are 10 m3/s,5 m3/s and 8 m3/s respectively. The velocity of liquid in the tube (4) having cross - section of 0.5 m2 is

a body executes SHM with an amplitude A . at what displacement from the mean position is the potential energy of the body one -fourth of its total energy

A circular shaft of diameter d resists the maximum shear stress τ caused by torque T. If the same torque is applied to a shaft having diameter 2d and length half the length of shaft of diameter d, the maximum shear stress developed in shaft (having diameter 2d) is:

A series RLC circuit has inductance of 0.12 H, capacitance of 480 nF and resistance of 23 Ω is connected to a 230 V AC supply whose frequency can be varied. What is the source frequency for which average power absorbed by the circuit is maximum? Also, find the value of maximum power.

Determine the relationship that governs the velocities of four cylinders if vA, vB, vC and vD represents velocities of block A, B, C and D. Consider downward velocity as positive and strings inextensible.

A nucleus of mass number A, originally at rest, emits an α-particle with speed v. The daughter nucleus recoils with a speed

In a Millikan's oil drop experiment , an oil drop of mass 0.64×10−14 kg carrying a charge 1.6×10−19 C remains stationary between two plates separated by a distance of 5 mm. The voltage that must be applied between the plates is-[Take g=9.8 ms−2 ]

28. A staircase contains three steps having height 10 cm each . If each are 20 cm wide then the the minimum horizontal velocity of a ball moving off plane so as to hit the lowest plane directly is

What is torque??What is Plank's Constant??

In the given network, C1=10μF, C2=5μF and C3=4μF. What is the resultant capacitance between A and B?

The bulk modulus of a sphere is ′K′. If it is subjected to uniform pressure ′p′ then fractional decrease in its radius is

Explain the working of electric motor

The output sequence y[n] and the pulse response h[n] of a discrete system are given by,y[n]={1↑,1,2,−1,3}h[n]={1↑,2,3}The input sequence x[n] is

If a>3 and A,B,C are variable angles of △ABC, such that √2a2−9cotA+2acotB+√2a2+9cotC=12a, then the minimum value of cot2A+cot2B+cot2C=