Question

multiple choice question
magnetic fields are represented by magnetic field lines drawn to indicate how

an electron would move if it were restricted to motion perpendicular to the center of a bar magnet
the north pole of a small magnet would respond at that point
an electron would move if it were free to move in any direction
the south pole of a small magnet would respond at that point

Explanation:

Magnetic field lines are used to represent the direction of the magnetic field. By convention, the direction of the magnetic field at a point is the direction in which the north pole of a small magnet (a compass needle) would point. So, magnetic field lines indicate how the north pole of a small magnet would respond at that point.

Answer:

the north pole of a small magnet would respond at that point