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The magnetic dipole moment of earth is 6...

The magnetic dipole moment of earth is `6*4xx10^(21)Am^2`. If we consider it to be due to a current loop wound around the magnetic equator of the earth, then what should be the magnitude of the current? Take earth to be a sphere of radius `6400km`.

A

`5 xx 10^(7)` A

B

`25 xx 10^(6)` A

C

`5 xx 10^(6)` A

D

`8 xx 10^(7)` A

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The correct Answer is:
A
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