An ordinary magnetic compass is placed flat on the ground.A wire carrying a large current i from east to west is placed directly above the compass.The end of the compass needle marked "N" will point:
A)north
B)south
C)east
D)west
E)the compass will act as an electric motor, hence the needle will keep rotating

Question

Quizplus · Accepted Answer

The wire carrying a current above the compass will create a magnetic field perpendicular to the direction of the current. This magnetic field will affect the magnetic field of the earth that the compass needle aligns with, causing the needle to rotate. As a result, the north end of the needle will be drawn towards the south, and the south end will be drawn towards the north. Therefore, the end of the compass needle marked "N" will point south.

An Ordinary Magnetic Compass Is Placed Flat on the Ground