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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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Important Questions on Electromagnetic Induction

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

L

and

R

denote inductance and resistance respectively, then the dimension of

\frac{L}{R}

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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

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 32

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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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 33

The number of turns in the coil of an AC generator is

5000

and the area of the coil is

0.25

m^{2}

. The coil is rotated at the rate of

100

cycles/s in a magnetic field of

0.2

Wb /

m^{2}

. The peak value of the emf generated is nearly,

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Gamma Question Bank for Medical Physics>Chapter 21 - Electromagnetic Induction>Assignment Set-2>Q 1

A uniform magnetic field exists in space as

\vec{B} = 4 \hat{i} T .

The magnetic flux through an area

\vec{S} = (2 \hat{i} + 4 \hat{j}) m^{2}

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

Important Questions on Electromagnetic Induction

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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