Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 72 - 76 of 124

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Question number: 72

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

The peak value of an alternating e. m. f. E given by E = E 0 cos t is 10 volts and its frequency is 50 Hz. At time , the instantaneous e. m. f. is

Choices

Choice (4) Response

a.

1 V

b.

10 V

c.

5 V

d.

Question number: 73

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A transformer has turn ratio 100: 1. If secondary coil has 4 amp current then current in primary coil is

Choices

Choice (4) Response

a.

4 A

b.

0.04 A

c.

400 A

d.

0.4 A

Question number: 74

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An inductor (L = 100 mH), a resistor (R = 100Ω) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit 1 ms after the short circuit is

Choices

Choice (4) Response

a.

1 A

b.

0.1 A

c.

e A

d.

Question number: 75

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

A small coil of N 1 turns, l 1 length is tightly wound over the center of a long solenoid of length l 2, area of cross-section A and number of turns N 2. If a current I flows in the small coil, then the flux through the long solenoid is,

Choices

Choice (4) Response

a.

b.

c.

zero

d.

Question number: 76

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A 50 Hz a. c. current of crest value 1A flows through the primary of a transformer. If the mutual inductance between the primary and secondary be 1.5 H, the crest voltage induced in secondary is-

Choices

Choice (4) Response

a.

471 V

b.

300 V

c.

150 V

d.

75 V

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