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JAMB Physics 2020 Paper

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Question : 21

Total: 38

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

0 $^o$ and 0 $^o$
60 $^o$ and 60 $^o$
90 $^o$ and 90 $^o$
90 $^o$ and 0 $^o$

Solution:

Concept:

The angle between a freely suspended magnetic needle and the horizontal is the angle of dip.

Explanation:

At the Earth's north magnetic pole, the magnetic field lines are vertical, so the dip angle is

90^\circ

.

At the magnetic equator, the magnetic field lines are horizontal, so the dip angle is

0^\circ

.

Therefore, the magnetic needle makes

90^\circ

with the horizontal at the pole and

0^\circ

at the equator.

Answer:

90^\circ

and

0^\circ

— Option D

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