Two long, parallel wires separated by 2.10 cm carry currents in opposite directions. The current in one wire is 1.40 A, and the current in the other is 3.30 A.

(a) Find the magnitude of the force per unit length that one wire exerts on the other. N/m
(b) Is the force attractive or repulsive? attractive repulsive Need Help?

Explanation:

Current in wire one,

Current in wire 2,

Separation between two parallel wires, d = 2.1 cm

(A) We need to find the magnitude of the force per unit length that one wire exerts on the other. It is given by the formula as follows :

So, the force per unit length that one wire exerts on the other is .

(B) If the current is acting in opposite direction, then te force between them is repulsive.