Question

Two straight parallel conductors of 5 m length each and separated by a distance of 1 cm in free space carry currents of 2A and 3A, respectively, in the same direction. The force per unit length on either of the conductor is

• A. an attractive force of \(1.2 \times 10^{-4} \text{ Nm}^{-1}\)
• B. a repulsive force of \(1.2 \times 10^{-4} \text{ Nm}^{-1}\)
• C. a repulsive force of \(6 \times 10^{-4} \text{ Nm}^{-1}\)
• D. an attractive force of \(6 \times 10^{-4} \text{ Nm}^{-1}\)
• E. a repulsive force of \(4\pi \times 10^{-7} \text{ Nm}^{-1}\)

Hint:

Like poles repel, like charges repel, but LIKE currents attract. This is a common point of confusion for students. Always remember same direction = attraction.

Answer 1

The Correct Option is A