NEET Physics: Questions 787 - 791 of 2098

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Question number: 787

» 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 t=1600sec , the instantaneous e. m. f. is

Choices

Choice (4) Response

a.

1 V

b.

10 V

c.

5 V

d.

53V

Question number: 788

» 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: 789

» 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

Circuit diagram consist of inductor, resistor and battery

Circuit Diagram Consist of Inductor, Resistor and Battery

In figure inductor, resistor and battery connected in series.

Choices

Choice (4) Response

a.

1 A

b.

0.1 A

c.

e A

d.

1eA

Question number: 790

» 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.

μ0N1N2AIl2

b.

μ0N12AIl1

c.

zero

d.

infinite

Question number: 791

» 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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