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. constant magnetic field is directed vertically upward
b. constant magnetic field is directed vertically downward
c. A magnetic field whose magnitude is decreasing is directed vertically downward
d. A magnetic field whose magnitude is decreasing is directed vertically upward
e. A magnetic field whose magnitude is increasing is directed vertically downward

Question

24-03-2020
Physics

contestada

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. constant magnetic field is directed vertically upward
b. constant magnetic field is directed vertically downward
c. A magnetic field whose magnitude is decreasing is directed vertically downward
d. A magnetic field whose magnitude is decreasing is directed vertically upward
e. A magnetic field whose magnitude is increasing is directed vertically downward

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Vespertilio Vespertilio · Answer 1 · 2020-03-28T10:28:01+01:00

Answer:

option (c)

Explanation:

The induced current in the coil is clock wise as seen from thee top. So, the induced magnetic field is in vertically downward direction.

According to the Lenz law, the magnetic field applied across the coil is in vertically downward direction and it is decreasing in nature.

So, the induced current is in the direction such that the direction of magnetic field due to the induced current will try to increase the applied magnetic field.