Answer:
(b,c)When a circular
coil expands radially in a region of magnetic field, induced e.m.f developed is
Here,
magnetic field B is in a plane perpendicular to the plane of circular coil. As
e = 0, magnetic field must be in the plane of circular coil so that its
component perpendicular to plane of coil is zero.
Further,
if the magnetic field has a component perpendicular to the plane of the coil,
whose magnitude is decreasing suitably so that magnetic flux linked with the
coil stays constant then
Choices (b)
and (c) are correct.
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