A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 180 o to deflect the magnet by 30 o from magnetic meridian. When this magnet is replaced by another magnet, the upper end of wire is rotated through 270 o to deflect the magnet 30 o from magnetic meridian. The ratio of magnetic moments of magnets is
Text Solution
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Let 
and 
be the magnetic moments of magnets and 
the horizontal component of earth's field.
We have 
.
If 
is the twist of wire, then 
being restoring couple per unit twist of wire
Here 
So, 
(For deflection 
of I magnet)
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