A small magnet of magnetic moment 4A-m2 ...

A small magnet of magnetic moment 4A-m2 is placed on a deflection magnetometer in tan-B position at a distance of 20cm from the compass needle. At what distance from compass needle should another small magnet of moment `0.5A-m^(2)` be placed such that the deflection of the needle remains zero ?

12 cm

10 cm

20 cm

30 cm

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