A negatively charged disc is rotated clockwise. What is the direction of the magnetic field at any point inside the plane of the disc?

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Into the page

Out of the page

Down the page

Up the page

answer is B.

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Detailed Solution

The disc can be assumed as combination of circular coils arranged in a plane in which current is flowing in anti-clockwise direction since negative charge is rotating in clockwise direction.

So, magnetic field at a point inside the disc plane will be out of the page.

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Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE