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JAMB Physics 2010 Paper

Question : 45

Total: 47

In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be

Solution:

Concept:

In magnetisation by stroking, the end of the steel bar last touched by a magnet has a polarity opposite to the pole of the magnet used.

Explanation:

The steel bar is stroked using the south poles of two magnets.

At the end where a south pole is finally lifted off, a north pole is induced on the steel bar.

Both ends,

T

and

V

, are the last touched ends, and each is touched by a south pole.

Therefore,

T

becomes a north pole and

V

also becomes a north pole.

So the polarities at

T

and

V

respectively are north and north.

Answer:

Option C: north and north.

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