A compass needle of magnetic moment 60...

A compass needle of magnetic moment 60 `Am^(2)` pointing geopgraphical north at a place where the horizontal component of earth fiedl is 40 `mu Wbm^(-2)` experiences a torque of `1.2 xx10^(-3)` Nm the declination of the place is

`30^(@)`

`45^(@)`

`60^(@)`

`25^(@)`

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