Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 25 - 29 of 121

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Question number: 25

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The current in a coil varies with respect to time t as I = 3t 2 + 2t. If the inductance of coil be 10 mH, the value of induced e. m. f. at t = 2 sec will be,

Choices

Choice (4) Response

a.

0.11 V

b.

0.14 V

c.

0.13 V

d.

0.12 V

Question number: 26

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

Which of the following is constructed on the principle of electromagnetic induction?

Choices

Choice (4) Response

a.

Galvanometer

b.

Generator

c.

Electric motor

d.

Voltmeter

Question number: 27

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

Assertion-Reason▾

Assertion (Ꭺ)

A transformer cannot work on dc supply.

Reason (Ꭱ)

dc changes neither in magnitude nor in direction.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 28

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

If the current in the primary coil is reduced from 3.0 ampere to zero in 0.001 second, the induced e. m. f in the secondary coil is 1500 volt. The mutual inductance of the two coils will be

Choices

Choice (4) Response

a.

0.005 H

b.

0.0005 H

c.

0.05 H

d.

0.5 H

Question number: 29

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current?

Graph of V→t (as cos function)

Graph of v→T (As Cos Function)

Here in figure voltage across a pure inductor is represented.

Choices

Choice (4) Response

a.

Diagram of current vs time (choice A)

Diagram of Current vs Time (Choice A)

In figure current i→t (time) graph is indicate.

b.

Diagram of current vs time (Choice B)

Diagram of Current vs Time (Choice B)

In figure current i→t (time) graph is indicate.

c.

Diagram of current vs time (Choice C)

Diagram of Current vs Time (Choice C)

In figure current i→t (time) graph is indicate.

d.

Diagram of current vs time (Choice D)

Diagram of Current vs Time (Choice D)

In figure current i→t (time) graph is indicate.

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