A circular coil expands radially in a region of magnetic fi…

Physics Electromagnetic Induction General MCQ (Single Correct)

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This is because

The magnetic field is constant.

The magnetic field is in the same plane as the circular coil and it may or may not vary. and

The magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasing suitably. .

Both

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The correct answer is:

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When a circular coil expands radially in a region of magnetic field, induced emf developed is

rate of change area

Here, magnetic field B is in a plane perpendicular to the plane of the circular coil.

As , magnetic field must be in the plane of circular coil so that its component perpendicular to the plane of the coil, whose magnitude is decreasing suitably so that magnetic flux linked with the coil stays constant then

So both options and are correct.

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