Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 264

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The general equation for the instantaneous e.m.f. of a generator (frequency $50 cycles s^{- 1}$ ), whose peak voltage is $200 V$ will be,

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Important Questions on Electromagnetic Induction

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 265

An alternating voltage of

e = 100 \sqrt{2} \sin (100 t) V

is connected to a condenser of

0.5 μF

through an A.C. ammeter. The reading of the ammeter will be,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 266

A hot wire ammeter reads

10 A

in A.C. circuit. The peak value of the current is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 267

A

40 Ω

electric heater is connected to

200 V

,

50 Hz

mains supply. The peak value of electric current flowing in the circuit is approximately,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 268

The r.m.s value of an A.C. of

50 Hz

is

10 A

. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 269

The r.m.s. value of induced voltage in a coil of

50

turns each of area

30 {cm}^{2}

rotating at

1000 r . p . m .

about an axis at right angles to magnetic field is

(B = 5 \times 10^{- 4} Wb m^{- 2})

,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 270

A

10 μ F

capacitor is connected across a

200 V, 50 Hz

A.C. supply. The peak current through the circuit is,

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 271

What is the

r . m . s .

value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of

2 A

in the same resistor?

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Physics Crash Course MHT-CET>Chapter 18 - Electromagnetic Induction>Exercise 1>Q 272

Alternating current cannot be measured by D.C. ammeter because