A circular loop of wire is in a region of uniform magnetic field is direct in to

Question

A circular loop of wire is in a region of uniform magnetic field is direct in to the plane in which the loop lies. Determine the direction of the induced current in the loop when B is increasing? (Clockwise, counterclockwise, no induced current. Determine the direction of the induced current in the loop when B is decreasing? (Clockwise, counterclockwise, no induced current. Determine the direction of the induced current in the loop when B is has a constant value? (Clockwise, counterclockwise, no induced current.

Explanation / Answer

when B is increasing

The induced current always wants to oppose the change in flux, so when B is increasing, the circular loop will want to induce a current so that the current creates a B field against the increasing B-field, Thus, the induced current will be Clockwise.

when B is decreasing

when B is decreasing, the circular loop will want to induce a current so that the current creates a B field against the decreasing B-field. Thus, the induced current will be CounterClockwise.

when B has constant value

Since there is no change in flux because B is constant and A is constant, so there is NO induced current.

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