Two long parallel wires are separated by a distance of `2.50 cm`. The force per unit length that each wire exerts on the other is `4.00xx10^-5 N/m`, and the wires repel each other. The current in one wire is `0.600A`.
a. What is the current in the second wire ?
b. Are the two currents in the same direction or in opposite direction?

Explanation

a. `F/l=(mu_0/(2pi))(i_1i_2)/r`
`:. 4xx10^-5=((2xx10^-7)(0.6)i_2)/(2.5xx10^-2)`
`:. i_2=8.33A`
`b. Wires repel each other if currents are in opposite directions.