Magnetic field two parallel wires

[goWlfpack]

Homework Statement

Two parallel wires are separated by 5.30 cm, each carrying 2.5 A of current in same direction. What is the magnitude of the force per unit length between the wires?

Homework Equations

B2=(mo constant)I2/2pid

The Attempt at a Solution

plugged 2.5 in for I and .053 for d
red x
help?

 

[Defennder]

That equation isn't enough You need the equation for the force on a current carry conductor due to a magnetic field.