Two long, parallel wires are separated by a distance of 2.30 cm . the force per unit length that each wire exerts on the other is 5.00×10−5 n/m , and the wires repel each other. the current in one wire is 0.700 a .(a) what is the current in the second wire? (b) are the two currents in the same direction or in opposite directions?

a. the current in the other second wire is 820.78 Ampere

b. the two currents are in opposite directions

Explanation:

a. the current in the second wire is given by the expression for the force per unit lenght between two wires

where

substituting all these values into the expression for the force per unit length and then making the subject

Note: convert 2.3 cm to meters = 0.023 meters

making subject

simplifying will give

b. the force is attractive if the currents are in the same direction and repulsive if the force are in opposite directions