According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true?
1. There is no force on the magnet. All forces act on the wire to keep the net force equal to zero.
here is no force on the magnet. All forces act on the wire to keep the net force equal to zero.
2. There is an equal and opposite force on the magnet pointing to the left.
3. There is an equal and opposite force on the magnet pointing down.
4. There is an equal and opposite force on the magnet pointing up.
5. There is an equal and opposite force on the magnet pointing to the right.
3. There is an equal and opposite force on the magnet pointing down.
According to Newton's Third Law, for every action, there is an equal and opposite reaction. In this case, the action is the magnetic force on the wire, which points upward. Therefore, to satisfy Newton's Third Law, the reaction force must be equal in magnitude and opposite in direction to the magnetic force on the wire.
Option 4, "There is an equal and opposite force on the magnet pointing up," is the correct answer. According to Newton's Third Law, the magnet exerts a force on the wire, and the wire exerts an equal and opposite force on the magnet. Since the magnetic force on the wire points upward, the reaction force on the magnet must also point upward in order to fulfill Newton's Third Law.