- Two parallel wires X and Y carry the same current. There is a repulsive force per unit length F on each wire. The direction of the current in each wire is reversed. The current in X is doubled and the current in Y stays the same. The separation of X and Y is also doubled.
What is the magnitude and direction of the force per unit length on each wire?
| Magnitude | Direction | |
|---|---|---|
| A. | F | repulsive |
| B. | F | attractive |
| C. | F/2 | repulsive |
| D. | F/2 | attractive |