Question Detail
Question
If current in both conductors is doubled, the force between them becomes
Correct Answer
Option B is the correct answer.
Detailed Explanation
Force per unit length between two parallel current-carrying wires: F is proportional to I1*I2. Doubling BOTH currents multiplies the force by 2x2 = 4, so the new force is 4F.
Hint
Force per unit length between two parallel current-carrying wires: F is proportional to I1*I2.