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Q.

The magnetic field due to the earth is closely equivalent to that due to

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a

A large magnet of length equal to the diameter of the earth

b

A magnetic dipole placed at the centre of the earth

c

A large coil carrying current

d

Neither of the above

answer is A.

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Detailed Solution

The magnetic field due to the earth is closely equivalent to that due to a large magnet of length equal to diameter of the earth.
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