A current carrying loop of wire lies flat on a table top. When viewed from above

Question

A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense.
A. For points OUTSIDE the loop, the magnetic field caused by this current

a) circles the loop in a counterclockwise direction.
b) points straight up.
c) circles the loop in a clockwise direction.
d) points straight down.
e) is zero.


(b) For points INSIDE the loop, the magnetic field caused by this current

a) circles the loop in a clockwise direction.
b) points straight down.
c) circles the loop in a counterclockwise direction.
d) points straight up.
e) is zero.

Explanation / Answer

For A, the magnetic field outside of the loop must be pointing down by the right hand rule. For B, the same rule applies and the magnetic field is pointing up.

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