A circular coil expands radially in a region of magnetic field and ...

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A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because
\( \mathrm{P} \)
(a) the magnetic field is constant.
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(b) the magnetic field is in the same plane as the circular coil and it may or may not vary.
(c) the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasing suitably.
(d) there is a constant magnetic field in the perpendicular (to the plane of the coil) direction.
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