Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 313

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The reactance of a capacitor in an A.C. circuit is $10 Ω$ . If the frequency of A.C. is doubled, its reactance will become,

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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 314

The inductive reactance of a coil is

1000 Ω

. If its inductance and the frequency of A.C. supply are both doubled, then the reactance will become,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 315

In a series A.C. circuit,

R = 100 Ω, X_{L} = 300 Ω

and

X_{C} = 200 Ω

. The phase difference between the applied e.m.f. and the current will be,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 316

The $e . m . f .$ of A.C. source in $L - C - R$ circuit shown in the figure is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 317

An inductive coil has a resistance of

100 Ω

when an A.C. source of frequency

1000 Hz

is applied to the coil, the applied voltage leads the current by

45 ° .

The inductance of the

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 318

A series

LCR

circuit has the following values

R = 20 Ω, X_{L} = 10 Ω, E = 50 V (R M S)

at

ω = 400 rad s^{- 1} .

Current

2 A

leads the applied voltage. The value of the capacitative reactance

X_{C}

is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 319

When

100 V

D.C. flows in a solenoid, the current is

1.0 A

. When

100 V

A.C. flows, the current drops to

0.5 A

. If the frequency of A.C. be

50 Hz

, then the impedance and the inductance of the solenoid are,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 320

It is found that the current in the circuit is

0.50 A

with

D . C .

source and

0.40 A

with

A . C

. source. The voltage

E

for

D . C

. is

120 V

and for

A . C .

is

120 V

. The frequency of

A . C .

source is

60 Hz

. The inductance of the circuit is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 321

A variable capacitor and an inductive coil with negligible resistance are connected in series to an A.C. voltage of value

100 V

. The current in the circuit is

5 A

. When the capacitor decreases to half of its value, the current becomes

10 A

. The voltage across the capacitor in first case is,