A metallic loop is placed in a uniform magnetic field B with the plane of the loop perpendicular to B . Under which condition (s) given an emf will be induced in the loop? "If the loop is .....

rotated about one of its diameters

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A self-induced emf in a solenoid of inductance $L$ changes in time as $ϵ = ϵ_{0} e^{- K t}$ . Assuming the charge is finite, find the total charge that passes a point in the wire of the solenoid.

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Important Questions on Electromagnetic Induction and Alternating Currents

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Physics

IMPORTANT

Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 20

A transformer with efficiency

80 %

works at

4 kW

and

100 V

. If the secondary voltage is

200 V,

then the primary and secondary currents are respectively

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Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 21

Two coils have a mutual inductance

0.005 H .

The current changes in the first coil according to equation

I = I_{0} \sin (ω t),

where

I_{0} = 10 A

and

ω = 100 π rad s^{- 1} .

The maximum value of emf in the second coil is

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Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 22

In the adjacent circuit, the instantaneous current equation is

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IMPORTANT

Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 23

How many meters of thin wire is required to design a solenoid of length $1 m$ and $L = 1 m H$ ? Assuming that the cross-sectional diameter is very small.

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Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 24

The output voltage (taken across the resistance) of a

L C R

series resonant circuit falls to half its peak value at a frequency of

200 Hz

and again reaches the same value at

800 Hz .

The bandwidth of this circuit is:

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Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 25

The value of current in two series

L C R

circuits at resonance is the same when connected across a sinusoidal voltage source, then:

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Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 26

L C R

series circuit with

100 Ω

resistance is connected to an

A C

source of

200 V

and angular frequency

300 radians per second

. When only the capacitance is removed, the current lags behind the voltage by

60 °

. When only the inductance is removed, the current leads the voltage by

60 °

. Then, the current and power dissipated in

L C R

circuit are, respectively

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IMPORTANT

Physics Crash Course JEE Advanced>Chapter 16 - Electromagnetic Induction and Alternating Currents>Exercise 1>Q 27

At a frequency

ω_{0}

, the reactance of a capacitor is equal to that of an inductor. If the frequency is changed to

2 ω_{0}

, then the ratio of reactance of the inductor to that of the capacitor is

A self-induced emf in a solenoid of inductance L changes in time as ϵ=ϵ0e-Kt. Assuming the charge is finite, find the total charge that passes a point in the wire of the solenoid.

Important Questions on Electromagnetic Induction and Alternating Currents

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A self-induced emf in a solenoid of inductance $L$ changes in time as $ϵ = ϵ_{0} e^{- K t}$ . Assuming the charge is finite, find the total charge that passes a point in the wire of the solenoid.