NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 694 - 697 of 2184

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Question number: 694

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

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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 3 are correct

b.

1 and 2 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Question number: 695

» Electromagnetic Induction & Alternating Currents » Lenz's Law

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Assertion-Reason▾

Question

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.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 696

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

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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 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: 697

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

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MCQ▾

Question

A 120 Volt ac source is connected across a pure inductor of inductance 0.70 H. If the frequency of the ac source is 60 Hz, the current passing through the inductor is

Choices

Choice (4) Response

a.

4.55 amp

b.

0.455 amp

c.

3.55 amp

d.

0.355 amp