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Earth's Magnetism

A magnetic ne...

Question

A magnetic needle free to rotate in a vertical plane, orients itself with its axis vertical at a certain place on the Earth. What is the value of Horizontal component of Earth's field?

A

1

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B

0

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C

90

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D

infinite

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Solution

The correct option is A 0
Since the magnetic needle orients itself with its axis vertical, thus all the magnetic field must be in vertical direction and so horizontal component of earth's magnetic field must be zero.

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