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A time-varying magnetic field is directed into the page as shown in figure and it is decreasing at constant rate of $150 T / s .$ The reading of ammeter 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 41

A vertical ring of radius

r

is made of a uniform wire of resistance

R .

It slips vertically between two frictionless and resistanceless vertical rails. There is a uniform magnetic field

B

perpendicular to plane of ring and rails as shown in figure. When the speed of ring is

v,

then the current in section

P Q

at that instant is

\frac{N B v r}{2 R} .

Value of

N

is _____

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 42

Flux

(ϕ)

in a closed conducting loop of resistance

10 Ω

varies with time

(t)

ϕ = 2 t^{2} + 3 t + 1 Wb,

where

t

is in seconds. The charge flown (in C) through a cross-section between

t = 0

t = 2 s

is _____

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment>Q 55

A semicircular wire of radius $R$ is moving in a magnetic field $B$ as shown in the figure. The emf (in $V$ ) induced across the wire is
(Given $B R V = 8$ volt)

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

A square loop of side $a$ has resistance $R$ and lies at distance $a$ from an infinite straight wire carrying $I_{0} .$ Find the charge flown through the loop when the loop has turned through an angle of $120$ about an axis $A B$ as shown.

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

A conductor of length

l

is placed perpendicular to a horizontal uniform magnetic field

B .

Suddenly a certain amount of charge is passed through it, when it is found to jump to a height

h .

The amount of charge that passes through the conductor is :

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

In a square loop of side length

' a',

current

I_{0}

is flowing as shown. Magnetic flux associated with region

x > 0

x y

plane is

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

A rectangular loop of width

b = (e - 1) a,

length I, mass

m

and resistance

R

is placed closed to and coplanar with a very long fixed straight conductor carrying

I_{0} .

The current in the conductor is suddenly switched off. Velocity of loop after current is switched off, is

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

In the given

L R

circuit, switch

S

is closed at

t = 0 .

The energy stored in the magnetic field, at time

t_{0} = \frac{3 L}{2 R} \ln 2

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A time-varying magnetic field is directed into the page as shown in figure and it is decreasing at constant rate of 150 T/s. The reading of ammeter is

Important Questions on Electromagnetic Induction

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A time-varying magnetic field is directed into the page as shown in figure and it is decreasing at constant rate of $150 T / s .$ The reading of ammeter is