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Answer:

Electromagnetism is a branch of physics involving the STUDY of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles

Electromagnetic force is defined as a type of force that is PRESENT between the charged particles and a combination of magnetic and electrical forces.

The electromagnetic force is caused by the exchange of photons (EFFECTIVELY 'particles' of light) and the chance of photons being emitted or absorbed is related to the charge on an object.Nov 10

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Answer:

1. by CHANGE in MAGNETIC flucks

2. by relative motion between CONDUCTOR and magnetic field

Answer:

hey here is your answer hope u understand

EXPLANATION:

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ANSWER:

HTTPS://www.youtube.com/watch?v=RgjuM0KaSyM

Answer:

Froth floatation method is used for concentration of the ores of the metals WHOSE ores are in sulphide form. ... The sulphide ore of metal is removed with SIEVES in a second vessel and washed with WATER. By this method, ores LIKE copper pyrites are concentrated and clay, sand ETC. are removed.

Answer:

Maria Goeppert Mayer (June 28, 1906 – February 20, 1972) was a GERMAN-born AMERICAN theoretical PHYSICIST, and Nobel laureate in ...

Died: February 20, 1972 (aged 65); San DIEGO, California, United States

Awards: Nobel Prize in Physics (1963)

Children: 2

Born: Maria Göppert; June 28, 1906; KATTOWITZ, German Empire; (today Katowice, Po.

T1 - 227°C = 500K

T2 - 27°C = 300K

N = 1-T2/T1

N = 1-3/5

N = 2/5

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ANSWER:

a 2nπ is the answer is YES

0.2*546/885-55554*5559 8854. 8888%[email PROTECTED]₹₹

The electric potential energy of any given charge or system of changes is TERMED as the total work done by an external AGENT in BRINGING the charge or the system of charges from infinity to the present configuration without undergoing any acceleration.

Definition: Electric potential energy is defined as the total potential energy a unit charge will possess if located at any point in the OUTER space.

.

ANSWER:

CNT is a ENERGY storage

CNT field EMISSION

Explanation:

When light SHINE onto a bubble it APPEARS to change colour.Unlike those seen in a rainbow,which arise for differential REFRACTION,the colours seen INA soap bubble arises from interference of light REFLECTING off the front and back surface of the thin soap

ANSWER:

acceleration = Force/mass

Acceleration = 30-20/5

Acceleration = 2m/s^2

T = m(g+a) for SMALLER BLOCK

T = 2(2+10) = 24N

Also same in Large block

T = m(g-a)

T = 3(10-2) = 24N

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Answer:

AB is 7 kgm² and radius of gyration is √(0.7) m

there are four POINT masses 1kg, 2kg, 3kg and 4kg are located at the CORNERS A, B , C and D respectively of a square ABCD of side 1M as shown in figure.

now MOMENTUM of inertis about AB , I =

= (1kg)(0)² + (2kg)(0)² + (3kg)(1m)² + (4kg)(1m)²

= 0 + 0 + 3 kgm² + 4kgm²

= 7 kgm²

now let radius of gyration is r

so, (1 kg + 2kg + 3kg + 4kg)r² = I = 7kgm²

⇒10r² = 7

⇒r = √(0.7) m

also read similar questions: four particles of mass 1kg, 2kg, 3kg, 4kg are PLACED at the four vertices a,b,c,d of a square of side 1m. find the posit...

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Explanation:

HOUSEHOLD uses= 4567 wh=4567/1000kwh=enegy

no. of days=10

we know that

P=E/T

E=P×T

so,

energy consumed in 10 days=4567/1000×10=45.67

no. of UNITS of energy household CONSERVE is 45.67 units

Answer:

It CANOT USEABLE

EXPLANATION:

Because if we will use it it will destroy

Distance to MOON is OE is 3.82 × km

Explanation:

Given data

distance away from your EYES OF = 60 cm

size of the moon CD = 0.55 cm

diameter AB = 3500 km

solution

we take here fig so as PER fig

here moon to eyes distance is OE

as here ΔOAB and ΔOCD both are similar so that

   ........................1

put here value

SOLVE we get

OE = 381818.182

so here distance to moon is OE is 3.82 × km

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Distance to the Moon

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ANSWER:

I. HGS, CuFeS

2.CuFeS,FEO

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Effective RESISTOR in PARALLEL

• RP= R/n
• effective cuttent= 7.62 A
• EFFECTIVE resistor= 3.16 OHM's

Answer:

LENZ's law. [ lĕnt′sĭz ] A principle stating that an electric current, induced by a source such as a changing magnetic field, ALWAYS creates a counterforce opposing the FORCE INDUCING it. This law explains such phenomena as diamagnetism and the ELECTRICAL properties of inductors.

Explanation:

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ANSWER:

I THINKS that

• ZINC granules
• HCL
• soap solution
• candle

Answer:

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Explanation:

The conventional (Rayleigh) limit for the angular resolution (in radians) of an 'ideal' TELESCOPE is that angular separation of the centres (in radians) of the SPOTS must be more than 1.22*LAMBDA/D, where lambda is the wavelength of the light and D is the limiting DIAMETER of the aperture.

Answer:

paramagnetic - do not SHOW DIPOLE moment

di magnetic- magnetise in DIRECTION of magnetic field

ferro magnetic - highly magnetic substances

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ANSWER:

UNIFORM ACCELERATION MOTION not SURE

Answer:I think TESTTUBE ,lime water ,insence STICK, matchbox BURNER

Explanation:

Answer:

ALPHA PARTICLES consist of a clump of two neutrons and two protons. Beta particles are single electrons (or POSITRONS, e+). Both kinds of particles are emitted from atomic nuclei. Alpha particles change the atom into one with a lower atomic number by EJECTING protons.

Answer:

velocity of first OBJECT is 9m/s.

Explanation:

mass 1= 50g

mass 2=100g

INITIAL velocity 1=5m/s

Initial velocity 2=10m/s

Final velocity 1=?

Final velocity 2=8m/s

now TAKE momentum of the objects

p=mv (initial momentum)

50*5+100*10=1250gm/s-------------1

p=mv (final momentum)

50*v+

100*8=(50v+800)m/s------------2

Now combine 1 and 2-----

1250gm/s=50v+800m/s

1250-800=50v

450=50v

50v=450

v=450/50

v=9m/s.

Therefore velocity of the first object is 9m/s.

Electromagnetic INDUCTION is where a voltage or current is PRODUCED in a conductor by a changing

magnetic flux ...

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ANSWER: if u are LOOKING for FORCE, then F = ma = 10 kg x (v-u)/t

ANSWER:

• ELEMENT of ATOMIC number 6 is carbon.
• focal length is 10 CM.

Explanation:

No benefit will occur becoz WITHOUT plaster of paris.... The STATUES cannot made without POP... And the plaster done on the FRACTURED PART couldn't take place

the SI UNIT of magnitic INDUCTION is JOULE

Answer:

the focal length of the concave mirror is 10 because the relationship between focal length and radius of CURVATURE is f is equals to 1 by 2 16 year f is equals to minus 20 by 20 the focal length is 10 according to sign CONVENTION it is minus 10 centimetres

The principle of electric motor is when a current carrying conductor is PLACED in a MAGNETIC FIELD it experiences a force. In case of dc motor we have field windings on stator and armature on the rotor. The field and the armature are connected to the dc supply. The field WINDING generates a constant dc flux.

ANSWER:

YAA I am USING the TECHNOLOGY

ANSWER: answer is 6

Explanation:R1 and R2 are connected in PARALLEL , therefore their equivalent resistance is 3

Similarly, the equivalent resistance of R3 andR4 is 3

Hence TOTAL resistance is 6 ohm

ANSWER:

the ANSWERS is GIVEN above

ANSWER:

WORK = 8πr^2 T

Work =

R = 10^-2

T = .3

work =24π × 10^-5

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Every magnet has two sides: a north pole and a south pole. ... This is because the Earth's CORE (its centre) is a large, weak magnet. Your little, strong magnet lines up with Earth's magnetic core, so it POINTS north. That's how a magnetic compass works.

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Answer:

1/1000/1000×1000×1000

1/100000

Answer:

consider two points A and B having MASS M1 and M2.

F=Gm1.m1/r2

where G, GRAVITATIONAL constant

ANSWER:

we are not ABLE to sse the thing

we are become WEEK

we face FINANCIAL PROBLEM

ANSWER:

we are not that much capable to EXPLAIN the hole STEPS

ANSWER:

Explanation: LARGE NUMBER of slots MADE in RADIATORS to transfer air through it.....

Answer:

.  Why does a compass needle get deflected when BROUGHT near a bar magnet?

Ans. A compass needle is a small bar magnet with north and south pole. The compass needle deflects due to repulsion/attraction with the bar magnet.

3.  List the properties of magnetic lines of force.

Ans. Properties of magnetic field lines of force:

      (i) Magnetic field lines travel from N-pole of magnet towards 5-pole, outside the magnet and from S-pole to N-pole inside the magnet.

      (ii) The strength of magnet/magnetic field is given by how close the field lines are if the field lines are closer magnet is stronger.

      (iii) No two magnetic field lines ever intersect each other.

4.  Why don’t two magnetic lines of force intersect each other?

Ans. The magnetic field lines never intersect each other as an intersection of the field lines means the magnetic field at that point has two directions, which is not possible because the resultant force on a pole (north/south) at any point can only be in one direction.

5.  Consider a circular loop of wire lying in the plane of. the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.

Ans.



6.  The magnetic field in a given region is uniform. Draw a diagram to represent it.

Ans.



           The magnetic field in a given region is uniform can be represented by showing parallel lines at equidistance.

7.  Choose the correct option.

           The magnetic Meld inside a long straight solenoid-carrying current

           (a) is zero.

(b) decreases as we move towards its end.

           (c) increases as we move towards its end.

(d) is the same at all points.

Ans. (d) is the same at all points.

8.  Which of the FOLLOWING property of a proton can change while it moves freely in a magnetic field?

           (There may be more than one correct answer).

           (a) mass

(b) speed

           (c) velocity

(d) momentum

Ans. Velocity and momentum

9.  In activity 13.7 (on page 234) how do we think the displacement of rod AB will be affected if

           (i) current in rod AB is increased

           (ii) a stronger horse-shoe magnet is used and

           (iii) length of the rod AB is increased.

Ans. (i) If current in rod AB is increased its displacement will increase.

           (ii) If a stronger horse-shoe magnet is used then the displacement of rod AB will increase.

           (iii) If the length of the rod AB is increased force acting on it will increase and the displacement of the rod also increases.

10.  A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

           (a) towards south

(b) towards east

           (c) downward

(d) upward

           Ans. (c) downward

11.  State Fleming’s left hand rule.

Ans. According to this rule, stretch the thumb, fore-finger and middle finger of left hand such that they are mutually perpendicular. If the middle finger points in the direction of the magnetic field, the fore-finger points in the direction of flow of current, then the thumb points in the direction of motion i.e., force acting on the conductor.



12.  What is the principle of an electric motor?

Ans. The principle of an electric motor is based on Fleming’s left hand rule. i.e., a current carrying conductor experiences a force when placed in a magnetic field.

13.  What is the role of the split ring in on electric motor?

Ans. In an electric motor split ring acts as a commutator. Split ring is connected to the ends of the coil and the direction of current flowing in motor coil reverses after every half turn. Which RESULTS in the continuous rotation of the coil and the ends.

14.  Explain different ways to induce current in a coil.

Ans. We can induce current in a coil

           (i) by moving a coil in a magnetic field or by changing the magnetic field around it.

           (ii) By increasing the number of coils the induced current value can be increased.

15.  State the principle of an electric generator:

Ans. In an electric generator mechanical energy is used to rotate a conductor in a magnetic field to produce electricity.

           Fleming’s right hand rule is used where motion and magnetic field is given and the current is induced.

16.  Name some SOURCES of direct current.

Ans. Dynamo and battery cells.

17.  Which sources produce alternating current?

Ans. Dynamo or generators with split ring type commutator.

18.  Choose the correct option.

           A RECTANGULAR coil of copper wire is rotated in magnetic field. The direction of the induced current changes ones in each

           (a) two revolutions                      (b) one revolution

           (c) half revolution                        (d) one-fourth revolution

Ans. (c) half revolution

19.  Name two safety measures commonly used in electric circuits and appliances.

Ans. (i) Use earthing wiring for metallic body electrical appliances. (ii) Use miniature circuit breakers, (MCB) i.e., fuse

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Answer:

Large number of slots made in RADIATORS to TRANSFER AIR through it.....

ANSWER:

*They seek the path of LEAST RESISTANCE between opposite magnetic poles. ...

*They NEVER cross ONE another.

*They all have the same strength

Answer:

The HYSTERESIS LOSS RESULTS from the B-H characteristic following a different path for decreasing VALUES of H than for increasing values of H. If H is carried through a complete cycle from +Hmax to -Hmax and back to +Hmax, the B-H characteristic becomes a loop known as a hysteresis loop