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Figure shows two circular rings of radii $a & b (a > b)$ joined together by wire of negligible resistance. If the arrangement is placed in a time varying magnetic field, $\frac{d B}{d t} = k$ and if the resistance per unit length of wire is $λ,$ then induced current is

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Important Questions on Electromagnetic Induction

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 20

An electric motor runs a DC source of emf 200V and draws a current of 10A. If the efficiency is 40%, then the resistance of the armature is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 21

Figure shows part of a circuit. If

I = 5 A

and is decreasing at a constant rate of

10^{3} A / s

then

V_{B} - V_{A}

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 22

Two different coils have self inductances

L_{1} = 8 mH

and

L_{2} = 2 mH .

The current in both the coil is increased at same constant rate. At a certain instant power given to two coils is same. At that time the energy stored in both the coils are

V_{1} & V_{2}

respectively, then

\frac{V_{1}}{V_{2}}

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 23

A short solenoid of length

4 c m

, radius

2 c m

and

100

turns is placed inside and on the axis of a long solenoid of length

80 c m

and

1500

turns. A current of

3

A flows through the short solenoid. The mutual inductance of two solenoids is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 24

In the arrangement shown, what is the expression for emf induced in the smaller loop of radius

r ?

The current

I

varies as

I = 3 t + 5 (R > > r)

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 25

A uniformly wound solenoid coil of self-inductance

1.8 \times 10^{- 4} H

and resistance

6 Ω

is broken up into two identical coils. These identical coils are then connected in parallel across a

12 V

battery of negligible resistance. The time constant for the current in the circuit is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 26

An inductor of inductance

L

is decayed through a resistance

R .

A radioactive sample decays with an average life

T .

The value of

R

for which the electric energy stored in the inductor to the activity of radioactive sample remains constant

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 27

A bar magnet with its north (N) and south (S) poles is initially moving to the left, along the axis of fixed circular conducting loop as shown. A current

l

is induced in the loop. As seen from the magnet side

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Figure shows two circular rings of radii a & b (a>b) joined together by wire of negligible resistance. If the arrangement is placed in a time varying magnetic field, dBdt=k and if the resistance per unit length of wire is λ, then induced current is

Important Questions on Electromagnetic Induction

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Figure shows two circular rings of radii $a & b (a > b)$ joined together by wire of negligible resistance. If the arrangement is placed in a time varying magnetic field, $\frac{d B}{d t} = k$ and if the resistance per unit length of wire is $λ,$ then induced current is