A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet

depends on the diameter of ring and length of magnet.

An A.C. source is connected to a resistive circuit. Which of the following is true?

Current and voltage are in same phase

Current leads ahead of voltage in phase

Current lags behind voltage in phase

Any of the above may be true depending upon the value of resistance

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The current passing through a choke coil of $5$ Henry is decreasing at the rate of $2 A s^{- 1}$ . The emf developed across the coil 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 32

In the figure, the magnet is moved along the axis of the coil from one position to another position in $10^{- 3} s$ . Now magnet is at rest for $2 s$ , in its new position. The duration of induced emf in the coil is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 33

A square current carrying loop is changed to circular loop in time

t_{1}

. Then

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 34

A field of

\frac{5 \times 10^{4}}{π}

ampere-turns per meter acts at a right angle to a coil of

50

turns of area

10^{- 2} m^{2}

. The coil is removed from the field in

0.1

second. Then the induced emf in the coil is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 35

The magnetic flux through a circuit of resistance

R

changes by an amount

Δϕ

in time

Δ t

. Then the total quantity of electric charge

Q

that during this time passes at any point of the circuit is given by

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 36

A coil having

100

turns and area of

0.001 m^{2}

is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of

1.0 Wb m^{- 2}

. If the coil is rotated rapidly through an angle of

180 °

, how much charge will flow through the coil? The resistance of the coil is

10 Ω

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 37

A coil of effective area

4 m^{2}

is placed at right angles to the magnetic field

B

. The emf of

0.32 V

is induced in the coil, when the field is reduced to

20 %

of its initial value in

0.5 s

. Find

B

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 38

A coil having number of turns

N

and cross-sectional area

A

is rotated in a uniform magnetic field

B

with an angular velocity

ω

. The maximum value of the emf induced in it is-

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 39

A copper disc of radius

0.1 m

is rotated about its centre with

10

revolutions per second in a uniform magnetic field of

0.1 tesla

with its plane perpendicular to the field. The emf induced across the radius of disc is

The current passing through a choke coil of 5 Henry is decreasing at the rate of 2 A s-1. The emf developed across the coil is

Important Questions on Electromagnetic Induction

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The current passing through a choke coil of $5$ Henry is decreasing at the rate of $2 A s^{- 1}$ . The emf developed across the coil is