the direction same as field direction.

the direction opposite to the field direction.

The expression for the induced e.m.f. contains a negative sign e = - dϕ d t . What is the significance of the negative sign?

The induced e.m.f. opposes the change in the magnetic flux.

The induced e.m.f. is produced only when the magnetic flux decreases.

The induced e.m.f. is opposite to the direction of the flux.

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

E M B I B E

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

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An induced emf has

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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 72

Lenz's law provides a relation between

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 73

The expression for the induced e.m.f. contains a negative sign

[e = - \frac{dϕ}{d t}]

. What is the significance of the negative sign?

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 74

Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. The induced current in the inner loop

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 75

A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 76

Lenz's law is consequence of the law of conservation of

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 77

An electron moves along the line

AB

, which lies in the same plane as a circular loop of conducting wires as shown in the diagram. What will be the direction of current induced if any, in the loop?
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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 78

An electron moves on a straight line path $XY$ as shown. The $abcd$ is a coil adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?

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