Three Long,straight,parallel Wires All Lie in the Yz Plane and Each

Question 86
Multiple Choice

Three long,straight,parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction.The two outer wires are each 4.0 cm from the center wire.What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires? A)1.0 mN B)0.50 mN C)1.1 mN D)1.5 mN E)2.0 mN