NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 789 - 792 of 2142

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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.

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.

b.

c.

zero

d.

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

Question number: 792

» 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.

f Page
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