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(B) When a magnet is placed with its south pole pointing towards the geographic north,the null points are located on the axial line of the magnet.For

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$1.2 	imes 10^3 \, e.m.u.$

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(B) When a magnet is placed with its south pole pointing towards the geographic north,the null points are located on the axial line of the magnet.For a short magnet,the magnetic field $B$ on its axial line at a distance $d$ from its center is given by $B = \frac{2M}{d^3}$,where $M$ is the magnetic moment.At the null point,the magnetic field of the magnet is equal and opposite to the horizontal component of the Earth's magnetic field $(B_H)$.Given: $d = 20 \, cm$,$B_H = 0.3 \, gauss$.Equating the fields: $\frac{2M}{d^3} = B_H$.Substituting the values: $\frac{2M}{(20)^3} = 0.3$.$\frac{2M}{8000} = 0.3$.$2M = 0.3 	imes 8000 = 2400$.$M = 1200 \, e.m.u. = 1.2 	imes 10^3 \, e.m.u.$

$A$ very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained $20 \, cm$ away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point is $0.3 \, gauss$,the magnetic moment of the magnet is:

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