A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet. A force acts on the wire XY because of the magnetic field.
Each of the following actions is carried out separately.
The current in the wire XY is reversed.
The magnetic field is reversed.
Both the current in the wire XY and the magnetic field are reversed at the same time.
How many of these actions cause the direction of the force on the wire XY to be reversed?
0
1
2
3
