2 long, parallel wires carry current I in the same direction and are separated by a distance R.
(a) Solve for the magnitude/direction of the magnetic field of the first wire at the location of the second wire. (Be sure to draw a picture and label your axes in order to explain your answer.)
(b) Solve for the magnitude/direction of the force per unit length of the first wire on the second wire. (Be sure to draw a picture and label your axes in order to explain your answer.)
(c) Solve for the work per unit length of wire necessary move one of the wires so that the separation is increased from R to 2R.
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