Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 16 - 18 of 124

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Question number: 16

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A closed coil of copper whose area is lm × lm is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of 0.10 Wb/m 2. It is rotated through 180° in 0.01 second. Then (The resistance of the coil is 2.0Ω)

(1) The induced e. m. f. in the coil is 20 V

(2) The induced current in the coil is 10 A

(3) The induced e. m. f. in the coil is 10 V

(4) The induced current in the coil is 20 A

Select the correct answers and mark it according to the following codes:

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

Question number: 17

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Assertion-Reason▾

Assertion (Ꭺ)

Lenz’s law violates the principle of conservation of energy.

Reason (Ꭱ)

Induced e. m. f. opposes the change in magnetic flux responsible for its production.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 18

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

Core of a transformer can’t be made up of

(1) Steel (2) Alnico

(3) Iron (4) Soft iron

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

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