Question

Selena drew a diagram to show how current moves in a loop of wire that is placed between two magnets.

At top left a piece of magnet labeled N and at top right a piece labeled S. Between these a square coil of wire with green arrows at its ends away from the magnets pointing away from the magnets. Red arrows point from N to S.
Which best explains how Selena can correct her error?

She can change the magnets so like poles are facing each other.
She can change the arrows so they show current traveling in opposite directions on the sides of the loop.
She can change the arrows so they show the magnetic field reversing direction between the magnets.
She can change the magnetic poles so they are both on one side of the loop.

Answer 1

Answer: She can change the arrows so they show current traveling in opposite directions on the sides of the loop.

Reason: A single loop has one continuous current, so the currents on the two opposite sides must run in opposite directions. Selena’s arrows show both sides pointing away from the magnets, which is impossible for a single loop.