two long, parallel conductors carry currents in the same direction as shown in figure p30.63. conductor a carries a current of 130 a and is held firmly in position. conductor b carries a current ib and is allowed to slide freely up and down (parallel to a) between a set of nonconducting guides. if the mass per unit length of conductor b is 0.100 g/cm, what value of current ib will result in equilibrium when the distance between the two conductors is 3.00 cm?