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

Question

$2 \times 10^{-4} \, \text{N m}^{-1}$ [attractive]

$2 \times 10^{-7} \, \text{N m}^{-1}$ [attractive]

$2 \times 10^{-4} \, \text{N m}^{-1}$ [repulsive]

$2 \times 10^{-7} \, \text{N m}^{-1}$ [repulsive]

Solution

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