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Questions  >>  CBSE XII  >>  Physics  >>  Magnetism and matter
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A compass needle whose magnetic moment is $60Am^2$ pointing geographic north at a certain place, Where the horizontal component of earth's magnetic field is $40 \mu wbm^{-2}$ experiences a torque $1.2 \times 10^{-3}\;Nm$ What is the declination of the place?

$\begin{array}{1 1} 60^{\circ} \\ 30^{\circ} \\ 15^{\circ} \\ 65^{\circ} \end{array} $

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