First slide
Magnetic dipole in a uniform magnetic field
Question

A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of the wire is rotated through 180o to deflect the magnet by 30o from magnetic meridian. Now this magnet is replaced by another magnet. Now the upper end of the wire is rotated through 270o to deflect the magnet 30o from the magnetic meridian. The ratio of the magnetic moments of the two magnets is

Moderate
Solution

MBHsinθ=cα-θ,M1Bsin300M2Bsin300=1800-3002700-300 ; M1M2=1524=58

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