Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 75 - 78 of 124

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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

Question number: 77

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

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

The angular disc of copper, with inner radius a and outer radius b is placed in a uniform magnetic field B.

Choices

Choice (4) Response

a.

b.

c.

Zero

d.

Question number: 78

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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.

10 J

c.

1000 J

d.

5 J

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