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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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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Important Questions on Electromagnetic Induction

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 95

A circular wire of radius

r

rotates about its own axis with the angular speed

ω

in a magnetic field

B

perpendicular to its plane, then the induced

e . m . f .

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 96

A thin semicircular conducting ring

(PQR)

of radius

r

is falling with its plane vertical in a horizontal magnetic field

B

, as shown in The potential difference developed across the ring when its speed is

v

, is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 97

A conducting rod of length $2 l$ is rotating with constant angular speed $ω$ about its perpendicular bisector. A uniform magnetic field $\vec{B}$ exists parallel to the axis of rotation. The EMF induced between two ends of the rod is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 98

A loop ABCD is moving with velocity

v

towards right out of the region of the magnetic field of magnitude

2 T

as shown in the figure. The loop has a resistance of

4 Ω

and it is connected to a resistance of

9 Ω

. If a steady current of

2 A

flows in the loop, then the value of

v

is, [Given

A D = 30 cm

]

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 99

A bicycle generator creates

1.5 V

15 km h^{- 1}

. The EMF generated at

10 km h^{- 1}

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

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 101

A jet aeroplane has total wing span of

60 m

and moving with a speed of

400 m s^{- 1}

. If the earth's magnetic field is

0.3 G

, then the potential difference between the wingtips of a jet aeroplane is

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 102

A jet aircraft is flying due to South at

300 m s^{- 1}

at a place, where the vertical component of the earth's magnetic field is

80 μT

. The potential difference between wingtips, if they are

25 m

apart is

Consider a metal ball of radius r moving at a constant velocity v→ in a uniform magnetic field of induction B→. Assuming that the direction of velocity forms an angle α with the direction of B→, the maximum potential difference between points on the ball is

Important Questions on Electromagnetic Induction

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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