A current is induced in a conducting loop that lies in a horizontal plane, and t

Question

A current is induced in a conducting loop that lies in a horizontal plane, and the induced current is clockwise when viewed from above. Which of the following statements could be true? (more than one right answer , i think )

A magnetic field whose magnitude is increasing is directed vertically downward

A constant magnetic field is directed vertically upward

A constant magnetic field is directed vertically downward

A magnetic field whose magnitude is decreasing is directed vertically downward

A magnetic field whose magnitude is decreasing is directed vertically upward

Explanation / Answer

According to the Lenz's law induced current has a direction such that magnetic field due to the current always oppose the change in the flux that induce the current. Magnetic flux due to the induced current is vertically down ward. a)A magnetic field whose magnitude is increasing is directed vertically downward is wrong answer.
b)A constant magnetic field is directed vertically upward . This statement is also wrong because when magnetic field is constant there is no induced current. c)A constant magnetic field is directed vertically downward. This statement is also wrong. d)A magnetic field whose magnitude is decreasing is directed vertically downward. This statemnt is right because induced current is increasing the flux in verticaly down ward. e)A magnetic field whose magnitude is decreasing is directed vertically upward. This statement is also wrong.

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