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There exist a magnetic field perpendicular to the loop which varies uniformly with rate $α .$
Loop radius is a and resistance of the loop is $R .$ Induced power in the loop 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>Q 13

The primary and secondary coils of a transformer have

50

and

1500

turns, respectively. If the magnetic flux

ϕ

linked with the primary coil is given by

ϕ = ϕ_{0} + 4 t

, where

ϕ

is in

Wb

t

is in

s

and

ϕ_{0}

is a constant, the output voltage across the secondary coil is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 14

A solenoid of inductance

L

and resistance

R

has a soft iron core. It is connected to a battery of E.M.F

E

as shown in the figure and allowed to attain its steady state.

Q.15-16.jpg

At an instant, the iron core is suddenly pulled out and because of it, inductance decreases to

\frac{L}{3}

.
The work done by an external agent in pulling out the iron core is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 15

A solenoid of inductance $L$ and resistance $R$ has soft iron core. It is connected to a battery of emf $E$ as shown in figure and allowed to attain its steady state.

Question Image

At an instant, the iron core is suddenly pulled out and because of it inductance decreases to $\frac{L}{3}$ . If the iron core is pulled out completely at time $t = 0,$ then the current in the circuit as a function of time is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 1

A conducting ring of radius

R

is being moved in a region of uniform magnetic field as shown. Let

E_{A B}

represent the potential difference between

A

and

B

then

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

A thick conducting wire has a variable current flowing through it. Select the correct alternative

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 3

Figure shows a rod

A B

of length

2 L

being rotated with a constant angular velocity

ω

, about its centre

O

in a uniform magnetic field. If

V_{P Q}

is the emf between any two points

P

and

Q

on the rod, then

Question Image

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 4

Figure shows a conducting Rectangular loop of electrical resistance

R .

There exists a uniform magnetic field given by

\vec{B} = B_{0} (10 t^{2} - 5 t) \hat{k}

in the region. The current in the loop at

Question Image

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 5

An electron moves along the line $X O X'$ which lies in the same plane as the square loop of conducting wire as shown. The direction of induced current, if any in the loop is

Question Image

There exist a magnetic field perpendicular to the loop which varies uniformly with rate α. Loop radius is a and resistance of the loop is R. Induced power in the loop is

Important Questions on Electromagnetic Induction

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There exist a magnetic field perpendicular to the loop which varies uniformly with rate $α .$
Loop radius is a and resistance of the loop is $R .$ Induced power in the loop is