Electromagnetic Induction & Alternating Currents (KVPY Stream-SA (Class 11) Physics): Questions 1 - 3 of 3

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Appeared in Year: 2012

MCQ▾

Question

A circular loop of wire is in the same plane as an infinitely long wire carrying a constant current i. Four possible motions of the loop are marked by N, E, W and S as shown:

A circular loop of wire and an infinitely long wire

A Circular Loop of Wire and an Infinitely Long Wire

Figure shows a circular loop of wire is in same plane as an infinitely long wire carrying constant current i.

A clockwise current is induced in the loop when loop is pulled towards:

Choices

Choice (4) Response

a.

E

b.

N

c.

W

d.

S

Question number: 2

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Appeared in Year: 2013

MCQ▾

Question

The figure shows a bar magnet and a metallic coil. Consider four situations. An emf in the coil will be generated for the following situations,

A bar magnet and a metallic coil

A Bar Magnet and a Metallic Coil

Figure shows a bar magnet placed near to a vertically placed metallic coil.

(I) Moving the magnet away from the coil.

(II) Moving the coil towards the magnet.

(III) Rotating the coil about the vertical diameter.

(IV) Rotating the coil about its axis.

Select the correct option,

Choices

Choice (4) Response

a.

(I), (II) and (III) are correct

b.

(I) and (II) are correct

c.

(II) and (III) are correct

d.

(III) and (IV) are correct

Question number: 3

» Electromagnetic Induction & Alternating Currents » Lenz's Law

Appeared in Year: 2014

MCQ▾

Question

A bar magnet falls with its north-pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be.

Choices

Choice (4) Response

a.

Counter clockwise while the magnet is above the plane of the ring, and clockwise while below the plane of the ring

b.

Counter clockwise throughout

c.

Clockwise while the magnet is above the plane of the ring and counter clockwise while below the plane of the ring

d.

Clockwise throughout.

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