A small, conducting circular loop is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied. The current induced in the loop is

clockwise

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anti-clockwise

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zero

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clockwise or anti-clockwise depending on whether the resistance is increased or decreased

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Solution

The correct option is C zero
As the plane of the loop contains the axis of the solenoid, the changing magnetic flux density will be along the plane of the loop and hence there will be no change in flux across loop $(\to a r e a . \to B = 0)$ .
Therefore no emf is induced and then current in the loop is zero.

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True or false?

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A small, conducting circular loop is placed inside a long solenoid carrying a current. The plane of the loop contains the axis of the solenoid. If the current in the solenoid is varied. The current induced in the loop is

The correct option is C zeroAs the plane of the loop contains the axis of the solenoid, the changing magnetic flux density will be along the plane of the loop and hence there will be no change in flux across loop (→area.→B=0).Therefore no emf is induced and then current in the loop is zero.