Question

The north pole of a bar magnet is moved close to the north pole of another bar magnet that is suspended by a thread. How does the energy stored in the magnetic field change?(1 point)

The energy stored in the field increases because the magnet moves in the direction of the field.

The energy stored in the field increases because there is no friction.

The energy stored in the field decreases because there is no friction.

The energy stored in the field decreases because the magnet moves in the direction of the field.

Answer 1

The correct choice is: "The energy stored in the field decreases because the magnet moves in the direction of the field."

Explanation: The suspended magnet rotates so that opposite poles face and is pulled toward the approaching magnet. It therefore moves in the direction of the magnetic force (toward lower potential), so magnetic field energy decreases (converted into kinetic energy or heat).