A current-carrying loop of wire lies flat on a horizontal tabletop.When viewed from above,the current moves around the loop in a counterclockwise sense.For points on the tabletop inside the loop,the magnetic field lines caused by this current
A)circle the loop in a clockwise direction.
B)circle the loop in a counterclockwise direction.
C)point straight up.
D)point straight down.

Question

Quizplus · Accepted Answer

According to the right-hand rule for magnetic fields, the magnetic field lines created by a current-carrying loop of wire will point out of the plane of the loop inside the loop itself. Therefore, the correct answer is that the field lines point straight up (choice C).

A Current-Carrying Loop of Wire Lies Flat on a Horizontal