Question

A long wire A carries a current of 10 amp. Another long wire B, which is parallel to A and separated by 0.1 m from A, carries a current of 5 amp. in the opposite direction to that in A. What is the magnitude and nature of the force experienced per unit length of B [ $\mu _ { 0 } = 4 \pi \times 10 ^ { - 7 }$ weber/amp – m]

• A. Repulsive force of $10 ^ { - 4 } N / m$
• B. Attractive force of $10 ^ { - 4 } N / m$
• C. Repulsive force of
• D. Attractive force of

Answer 1

Answer: (A)

Repulsive force of $10 ^ { - 4 } N / m$

Answer 2

By using

⇒

Wires are carrying current in opposite direction so the force will be repulsive.