Electromagnetic Induction & Alternating Currents (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 7 - 10 of 11

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Question number: 7

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Appeared in Year: 2014

MCQ▾

Question

Two identical metallic square loops L1 and L2 are placed next to each other with their sides parallel on a smooth horizontal table. Loop L1 is fixed and a current which increases as a function of time is passed through it. Then loop L2

Choices

Choice (4) Response

a.

Remains stationary

b.

Moves towards L1

c.

Rotates about its center of mass

d.

Moves away from L1

Question number: 8

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A long vertical wire carrying current i produces a neutral point with the earth’s magnetic field at 10 cm from the wire. If the horizontal component of the earth’s magnetic field is 0.18 gauss, the current in the wire is –

Choices

Choice (4) Response

a.

0.50 A

b.

4.5 A

c.

5 A

d.

50 A

Question number: 9

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A long vertical wire carrying current i produces a neutral point with the earth’s magnetic field at 7 cm from the wire. If the horizontal component of the earth’s magnetic field is 0.18 gauss, the current in the wire is –

Choices

Choice (4) Response

a.

12.6 A

b.

63 A

c.

6.3 A

d.

0.63 A

Question number: 10

» Electromagnetic Induction & Alternating Currents » Faraday's Law

Appeared in Year: 2016

MCQ▾

Question

Two infinitely long parallel wires carry current of magnitude Equation and Equation and are at a distance Equation apart. The magnitude of the net magnetic field is found to reach a non – zero minimum value between the two wires and Equation away from first wire. The ratio of the two currents and their mutual direction is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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