Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 42

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A conducting rod is rotated in a plane perpendicular to a uniform magnetic field with constant angular velocity. The correct graph between the induced emf $(e)$ across the rod and time $(t)$ is

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Important Questions on Electromagnetic Induction

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 47

A coil of area

7 {cm}^{2}

and of

50

turns is kept with its plane normal to a magnetic field

B

. A resistance of

30 ohm

is connected to the resistance less coil.

B

is

75 \exp (- 200 t)

gauss. The current passing through the resistance at

t = 5

ms

will be-

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 58

The instantaneous magnetic flux

ϕ

in a circuit is

ϕ = 4 t^{2} - 4 t + 1 .

The total resistance of the circuit is

10 Ω .

At

t = \frac{1}{2} s

, the induced current in circuit is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 61

The magnetic flux in a closed circuit of resistance $10 Ω$ varies with time according to the equation, $ϕ = 6 t^{2} - 5 t + 1 .$ What is the magnitude of the induced current at $t = 0.25 s ?$

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 67

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 69

Two identical coaxial circular loops carry a current

i

each circulating in the same direction. If the loops approach each other

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 71

An induced emf has

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 94

Consider a metal ball of radius

r

moving at a constant velocity

\vec{v}

in a uniform magnetic field of induction

\vec{B}

. Assuming that the direction of velocity forms an angle

α

with the direction of

\vec{B}

, the maximum potential difference between points on the ball is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 100

A straight line conductor of length

0.4 m

is moved with a speed of

7 m s^{- 1}

to a magnetic field of intensity

0.9 Wb m^{- 2}

. The induced emf across the conductor is