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Question

How does a magnetic compass needle behave in a magnetic field?

A
It assures a position right angle to magnetic field
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B
It assures a position which follows a line of magnetic field
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C
It starts rotating
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D
none of these
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Solution

The correct option is B It assures a position which follows a line of magnetic field
A compass points north because all magnets have two poles , a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet.
The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.
Option B

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