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A compass needle whose magnetic moment i...

A compass needle whose magnetic moment is `60Am^2` points geographic north at a certain place where `H=40muT`. The compass needle experience a torque of `1*2xx10^-3N-m`. What is the declination at the place?

A

`30^(@)`

B

`60^(@)`

C

`45^(@)`

D

`90^(@)`

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The correct Answer is:
A
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