Answer:
For
circular coil
Magnetic
moment,
For
square coil
Magnetic
moment,
Moment of inertia of circular coil about the diameter as
axis, =
Moment of
inertia of square coil about an axis passing through its centre parallel to
breadth
.
Time
period of oscillation of the magnet in magnetic field is given by
and
and
Given,
so or
On solving,
a = 3 R.
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