Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 23

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A coil of resistance $20 Ω$ and inductance $5 H$ has been connected to a $100 V$ battery. The energy stored in the coil is

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Important Questions on Electromagnetic Induction

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 24

The magnetic energy stored in a long solenoid of area of cross-section

A

in a small region of length

L

is

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 25

An inductor is connected to a direct voltage source through a switch. Now

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 26

A long solenoid has self inductance

L .

If its length is doubled keeping total number of turns constant then its new self inductance will be

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 27

If

L

and

R

denote inductance and resistance respectively, then the dimension of

\frac{L}{R}

is

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 28

A solenoid has

2000

turns

wound over a length of

0.30 m

. The area of its cross-section is

1.2 \times 10^{- 3} m^{2}

. Around its central section, a coil of

300

turn

is wound. If an initial current of

2 A

in the solenoid is reversed in

0.25 s,

then the emf induced in the coil is

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 29

With the decrease of current in the primary coil from

2 A

to zero in

0.01 s

, the

e . m . f .

generated in the secondary coil is

1000 V .

The mutual inductance of the two coil is

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 30

Two coaxial coils are very close to each other and their mutual inductance is

5 mH .

If a current

50 \sin 500 t

is passed in one of the coils then the peak value of induced

e . m . f .

in the secondary coil will be

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 31

The coefficient of self induction of two inductor coils are

20 mH

and

40 mH

respectively. If the coils are connected in series so as to support each other and the resultant inductance is

80 mH

then the value of mutual inductance between the coils will be