NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 792 - 796 of 2320

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Question number: 792

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

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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: 793

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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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.

75 V

c.

300 V

d.

150 V

Question number: 794

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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MCQ▾

Question

The angular disc of copper, with inner radius a and outer radius b is rotating with a uniform angular speed ω, in a region where a uniform magnetic field B along the axis of rotation exists. Then, the emf induced between inner side and the outer rim of the disc is-

Angular disc of copper in magnetic field

Angular Disc of Copper in Magnetic Field

Choices

Choice (4)Response

a.

b.

c.

Zero

d.

Question number: 795

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

In an inductor of inductance L = 100 mH, a current of I = 10A is flowing. The energy stored in the inductor is

Choices

Choice (4)Response

a.

100 J

b.

5 J

c.

1000 J

d.

10 J

Question number: 796

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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MCQ▾

Question

Voltage (r. m. s) in the secondary coil of a transformer depends upon

(1) Voltage in the primary coil

(2) Ratio of number of turns in the two coils

(3) Frequency of the source

(4) Time-period of the source

Select the correct answers and mark it according to the following

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

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