Avertical straight wire carrying an upward 28-a current exerts an attractive force per unit length of 7.83 x 10 n/m on a second parallel wire 7.0 cm away. what current (magnitude and direction) flows in the second wire?

Since the force between wires is attraction type of force so current must be flowing in upward direction

Explanation:

Force per unit length between two current carrying wires is given by the formula

here we know that

now we will have

Since the force between wires is attraction type of force so current must be flowing in upward direction