Permanent magnetismEasy
Question
very small bar magnet is placed in the magnetic meridian with its north pole pointing towards 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 be 0.3 gauss, the magnetic moment of the bar magnet is
Options
A.8 × 102 e.m.u
B.1.2 × 103 e.m.u
C.2.4 × 103 e.m.u
D.3.6 × 103 e.m.u
= BH ⇒ M = 
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