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].