Explore topic-wise InterviewSolutions in Current Affairs.

tion:We USUALLY refer to visible light as having WAVELENGTHS of between 400 nm and 750 nm. (The RETINA of the eye actually RESPONDS to the lowest ultraviolet frequencies, but these do not normally reach the retina because they are absorbed by the cornea and lens of the eye.)

tion:Ampère-Maxwell law Maxwell's equations and the Lorentz force law TOGETHER encompass all the LAWS of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be immediately apparent. Faraday's law describes how changing magnetic fields PRODUCE ELECTRIC fields.

2nd part nhi AATA ABHI HUME sikhaya nhi hai

such-and-such DHL troughtexuFMgif FM is HMM

Heya mate......FORCES that are equal in SIZE but opposite in direction are called balanced forces. Balanced forces do not cause a change in motion. When balanced forces ACT on an object at rest, the object will not move. If you push against a WALL, the wall pushes back with an equal but opposite force.Hope it HELPS.....

2nd PART NHI aata, ABHI Hume sikhaya nhi hai

Bdyd UDHR hrhr hdrh dhrhr

udent,◆ Answer -L = 6.674 H◆ Explaination -# Given -Pb = 10 WVb = 110 VVs = 220 Vf = 50 HZ# SOLUTION -Current flowing through bulb is -I = Pb/VbI = 10/110 I = 1/11 AVoltage across inductor would be -V = √(Vs^2 - Vb^2)V = √(220^2 - 110^2)V = 110√3Reactance of the inductor would be -XL = V/I = 2πfLL = V / (2πfI)L = 110√3 / (2 × 3.14 × 50 × 1/11)L = 6.674 HTherefore, necessary inductance is 6.674 H.Thanks DEAR...

hsusvdjdhfbgvvuihji#ijH8C7G6

Transformer is the foremost reason that most of the electric POWER transmission in the world today is in the form of AC instead of DC. This is because transformer can easily step down or step up voltages which is ESSENTIAL for the EFFICIENT electric power transmission. Stepping up voltages to higher voltages before transmission at the generation end greatly reduces I2R losses over long distances. And it can be easily stepped down using transformer to REQUIRED lower voltages at the consumer end.

NOTHING BUT USE REASONCE OF FREQUENCY FORMULA AND U WILL GET THE GIVEN FREQUENCY IS EQUAL TO THE OBTAINED FREQUENCY SO THE CHANGE IN OSCILLATION IS ZERO HENCE THE VOLTAGE IS EQUAL TO THE GIVEN

ith Explanation:Assume that the alternating voltage given by The resulting alternating CURRENT in the CIRCUIT be with a phase change of Ф, LET Ф=p and amplitude be I ;THEREFORE power P at any INSTANT is we can write as where z is impedance.z is given by ∠δ in phasor, where δ is same as phase difference between current and voltage in the circuit.The power in phasor form given by ∠δ.where |p|= is therefore,rewriting the phasor, we can write power as δ

c) 6Explanation:Circuit resonance frequency = w = 600Hz (Given)Frequency = w1 = 500 (Given)Frequency = w2 = 600 Hz (Given)In a L-C-R AC circuit, the HALF power band WIDTH is the DIFFERENCE between two frequencies, namely w2 and w1, that corresponds to the current I( rms, max)/ √2 or equivalently half power in the series resonance curve. The Q factor is the measure of sharpness of resonance curve DEFINED as -Q = WO/(w2-w1), where wo is the resonance frequency.Thus,  Q = 600/(650–550)Q = 600/100Q = 6.

tion:If IDEAL and no LOSSES then the output POWER is equal the INPUT power. But depending on the PRIMARY to secondary turns ratio the output voltage will be directly this ratio, step up or down, and the current will be inverse to the ratio.

tion:Basically sharpness of resonance is the define as a Q FACTOR, which related to how fast energy decay in an OSCILLATING SYSTEM. sharpness of resonance are depend UPON two FACTORS, or we can say two generally factor that effect the sharpness ho resonance.

tion:The instrument, which is USED to measure the AC voltage ACROSS any two points of electric CIRCUIT is called AC voltmeter. If the AC voltmeter consists of rectifier, then it is said to be rectifier based AC voltmeter. The DC voltmeter MEASURES only DC VOLTAGES.

tal range , R = u²sin2θ/gwhere θ is ANGLE of elevation of projectile, u is velocity of projection and g is acceleration due to gravity.here, R = 3km = 3000m , g = 9.8 m/s² θ = sin^-1(4/5) we know, sin2θ = 2sinθcosθ = 2 × sin{sin^-1(4/5)} × COS{sin^-1(4/5)}= 2 × 4/5 × cos{cos^-1(3/5)}= 2 × 4/5 × 3/5 = 24/25 so, sin2θ = 24/25then, 3000 = u²(24/25)/9.8or, 3000 × 9.8 × 25/24 = u²or, 1000 × 25/8 = u² or, 125 × 9.8 × 25 = u² or, u² = (25 × 25 × 49) or, u = 175 m/s hence, velocity of projection is 175m/s

tion:4000a BOY a BALL UPWARD with

Helloराधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे राधे

enerator is an electric GENERATOR that converts mechanical energy into electrical energy in form of alternative emf or alternating current. AC generator works on the principle of ”Electromagnetic Induction”. Parts of an AC GeneratorAn Ac generator consists of two poles i.e is the north pole and south pole of a magnet so that we can have a uniform magnetic field. There is also a COIL which is rectangular in shape that is the ARMATURE. These coils are connected to the slip rings and attached to them are carbon brushes.The slip rings are made of METAL and are insulated from each other. The brushes are carbon brushes and one end of each brush connects to the ring and other connects to the circuit. The rectangular coils rotate about an AXIS which is perpendicular to the magnetic field. There is also a shaft which rotates rapidly.Learn more about Biot-Savart Law.Working of an AC GeneratorWhen the armature rotates between the poles of the magnet upon an axis perpendicular to the magnetic field, the flux which links with the armature changes continuously. Due to this, an emf is induced in the armature. This produces an electric current through the galvanometer and the slip rings and brushes.The galvanometer swings between the positive and negative values. This indicates that there is an alternating current flowing through the galvanometer

area enclosed by the ROD and u shaped WIRE changes every time due the rod's velocity.Due to that Magnetic flux changes PRODUCING induced current which INTURN is responsible for the retarding Lorentz force. The Lorentz force tries to BALANCE the force exerted for motion of rod.

in MAGNETIC flux DUE to change in AREA swept by the rod because it has velocity.

Average value of induced emf = 48 V.Explanation:Given:Number of turns of the coil, .Surface area of the coil, .Strength of the magnetic field initially, .Strength of the magnetic field after 0.2 s, .The magnetic flux through a surface is defined as where, = area vector of the coil which is DIRECTED along the normal to the plane of the coil and has magnitude equal to the surface area of the coil. = ANGLE between and .In the given question, the magnetic field is perpendicular to the area of the coil which means it is along the same direction as that of .THEREFORE, .The magnetic flux linked with the coil is given asAccording to the Faraday's law of electromagnetic induction, the emf induced in the coil is given by is the change in the magnetic field = Therefore, The average induced emf is given bySince, there is no TIME dependent term in the value of the induced emf, therefore,Thus, the magnitude of average emf induced in the coil is same as the magnitude of induced emf i.e., 48 V.

inductance is a measure of the induction of two CIRCUITS, the RATIO of two ELECTROMOTIVE forces in a circuit to the corresponding change of current in a neighbouring circuit .the UNIT of mutual inductance is Henry.

Explanation:The term MUTUAL SUGGESTS that the magnetic flux which is shared or common between TWO current carrying coils and which in term is dependent on the medium / material between the two coils. If the mutual flux is in a medium such as air then the magnetic flux DENSITY and will be ~ \mu_0.

nerators or alternators (as they are usually CALLED) operate on the same fundamental principles of electromagnetic induction as D.C. generators. Alternating voltage MAY be generated by ROTATING a coil in the magnetic field or by rotating a magnetic field within a stationary coil. The value of the voltage generated depends on- the number of turns in the coil. strength of the field. the SPEED at which the coil or magnetic field rotates.

udent,◆ ANSWER -I = -N(Φ₂-Φ₁)/5Rt◆ Explanation -Total resistance in the circuit is -R' = R + 4RR' = 4RAlso EMF induced in the coil is given by -V = -N.∆Φ/tV = -N(Φ₂-Φ₁)/tNow, induced CURRENT in the circuit will be -I = V/R'I = [-N(Φ₂-Φ₁)/t]/5RI = -N(Φ₂-Φ₁)/5RtHope this HELPS you...

udent,◆ ANSWER -(D) 62.8 μV◆ Explanation -Potential DIFFERENCE GENERATED between rim and axis of cycle is calculated by -EMF = 1/2 B.ω.l²EMF = 1/2 × B × 2πf × l²EMF = B × πf × l²EMF = 0.4×10^-4 × 3.14 × 2 × 0.5^2EMF = 62.8×10^-6 VEMF = 62.8 μVTherefore, EMF generated between rim and axis of cycle is 62.8 μV.Thanks DEAR...

udent,◆ Answer - (A)R1 : R2 = 2 : 1◆ Explanation -Given that self inductance of both solenoids is same.L1 = L2μₒ.N1².A1/l = μₒ.N2².A1/lN1².πr1² = N2².πr2²r1²/r2² = N2²/N1²r1/r2 = N2/N1r1/r2 = 200/100r1/r2 = 2Therefore, ratio of radii of cross-section of solenoids is 2:1.Thanks buddy...

icycle or walk for short distances.Use public transport.Use only natural LIGHT in the morning.Disposal of waste after SEGREGATION into renewable and non renewable.Reusable bottles , Pens ( avoid buying pens that DEMAND replacement of its plastic CARTRIDGE)

Most circuits have more than one COMPONENT, called a resistor that limits the flow of charge in the circuit. A measure of this limit on charge flow is called resistance. The simplest combinations of resistors are the series and parallel connections illustrated in Figure 1. The total resistance of a combination of resistors depends on both their individual values and how they are CONNECTED.In part a of the figure, resistors labeled R sub 1, R sub 2, R sub 3, and R sub 4 are connected in series along one path of a circuit. In part b of the figure, the same resistors are connected along parallel paths of a circuit.Figure 1. (a) A series connection of resistors. (b) A parallel connection of resistors.Resistors in SeriesWhen are resistors in series? Resistors are in series whenever the flow of charge, called the current, must flow through devices sequentially. For example, if current flows through a person holding a screwdriver and into the Earth, then R1 in Figure 1(a) could be the resistance of the screwdriver’s shaft, R2 the resistance of its handle, R3 the person’s body resistance, and R4 the resistance of her shoes. Figure 2 shows resistors in series connected to a voltage source. It seems reasonable that the total resistance is the sum of the individual RESISTANCES, considering that the current has to pass through each resistor in sequence. (This fact would be an ADVANTAGE to a person wishing to avoid an electrical shock, who could reduce the current by wearing high-resistance rubber-soled shoes. It could be a disadvantage if one of the resistances were a faulty high-resistance cord to an appliance that would reduce the operating current.)

it's MEAN the CAPACITY

wer 1 => sound waves travel faster in solids than in liquids, and faster in liquids than in gasses. While the DENSITY of a medium also affects thespeed of sound, the elastic PROPERTIES have a greater influence on the wavespeed. The density of a medium is the second factor that affects the speed of sound.____________(^^-^^)______________Answer 2=> The temperature of the Earth depends on a BALANCE between incoming energy from the Sun and the energy that bounces back into space.Carbon DIOXIDE absorbs heat that would otherwise be lost to space. ❤❤

10 secExplanation:this question is very easy by using CONCEPT of relatives velocity. UAB =Va-Vb =70-30 =40m/sAcc.ab = Aa-Ba =4-8 =-4m/s²now v = u+atVab=uab-aab. tsince body meet FINAL RELATIVE velocity (Vab ) =00 = 40-4t 4t = 40t=10 sec

acceleration is 4aExplanation:First we have to  diffrentiate displacementX= a+at+at^2 then VELOCITY is a+4at.Another TIME diffrentiation will GIVE U acceleration that is 4a

imately, all SI units must be TRACEABLE to Mass, Length and Time. The currentdefinition of the Ampere is:The constant current which will produce an attractive force of 2 × 10–7 newtons per metre of length between two straight, parallel CONDUCTORS of infinite length and NEGLIGIBLE CIRCULAR cross section placed one metre apart in a vacuum.As the Newton is a measure of force, and therefore given by Mass * Acceleration (second order SPEED, distance / time), the definition ultimately reduces to a form that is derived from only Mass, Length and Time.

To FIND TENSION force we need the weight developed in the string and here weight is the body pulling the string. TENSION T(=W) DEVELOPED IN THE STRING. DERIVATIONWhen a body is suspended by a string attached to a rigid support,the body,DUE to its weight W, pulls the string vertically downwards and the string in its stretched condition pulls the body upwards by a force which BALANCES the weight of the body. This force developed in the string is called tension(or the force of tension).MAY this will help UPls mark this as a BRAINLIST ANSWER

Oxidising is the CHEMICAL reaction which MEANS the IRON, oxygen and moisture content in the ATMOSPHERE will reacts ang gives a NEW product.iron+oxygen+moisture(water)=Rust