Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 81 - 84 of 121

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Question number: 81

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Assertion-Reason▾

Assertion (Ꭺ)

The induced e. m. f. and current will be same in two identical loops of copper and aluminum, when rotated with same speed in the same magnetic field.

Reason (Ꭱ)

Induced e. m. f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.

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.

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

d.

Ꭺ is false but Ꭱ is true

Question number: 82

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A current of 5A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50 % of power is lost, then the current in the secondary coil will be -

Choices

Choice (4) Response

a.

0.25A

b.

0.025A

c.

5A

d.

2.5A

Question number: 83

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

An alternating current is given by the equation i=i1cosωt+i2sinωt . The r. m. s. current is given by

Choices

Choice (4) Response

a.

12(i1+i2)

b.

12(i1+i2)2

c.

12(i12+i22)12

d.

12(i12+i22)12

Question number: 84

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A current increases uniformly from zero to one ampere in 0.01 second, in a coil of inductance 10 mH. The induced e. m. f. will be –

Choices

Choice (4) Response

a.

3 V

b.

4V

c.

1 V

d.

2 V

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