Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 15

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$L, C$ and $R$ stand for the inductance, capacitance and resistance respectively of $L C R$ circuit. Which of the following expressions has the dimension of frequency?

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Important Questions on Electromagnetic Induction

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 16

The unit of magnetic permeability can be written as

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 17

A current of

2 A

is established in an inductor of inductance

1 mH

in

0.02 s

. The magnetic energy stored in the inductor is

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 18

Two circular, similar and co-axial loops carry equal currents in the same direction. If the loops are brought nearer:

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 19

A coil having number of turns

N

and area

A

is rotated in a uniform magnetic field with angular velocity

ω

. The maximum induced emf in it is given by

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 20

When the number of turns in a coil is doubled without any change in the length of the coil, its self inductance

L

becomes

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 1

Under what condition induced current is produced in a closed coil?

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 2

Explain the symbols used in the expression

ε = - N \frac{∆ \emptyset}{∆ t}

.

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Bureau's Higher Secondary Physics Class 12>Chapter 9 - Electromagnetic Induction>MODEL QUESTIONS>Q 3

State Lenz's law.