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Question

Physics Question on Magnetic Force

Two parallel wires in free space are 10 cm apart and each carries a current of 10A in the same direction. The force exerted by one wire on the other [per unit length] is

A

2 × 10-4 Nm-1 [attractive]

B

2 × 10-7 Nm-1 [attractive]

C

2 × 10-4 Nm-1 [repulsive]

D

2 × 10-7 Nm-1 [repulsive]

Answer

2 × 10-4 Nm-1 [attractive]

Explanation

Solution

The correct answer is (A) : 2 × 10-4 Nm-1 [attractive].