A straight wire is carrying a current upward.Observed from above (i.e.,looking downward towards the wire),the magnetic field lines are
A) radially outward.
B) radially inward.
C) forming clockwise circles.
D) forming counter-clockwise circles.
E) directed toward the observer.

Question

Quizplus · Accepted Answer

According to the right-hand rule, when the thumb points in the direction of the current, the fingers show the direction of the magnetic field. In this case, the magnetic field lines will form counter-clockwise circles when observed from above.

A Straight Wire Is Carrying a Current Upward