Three infinite lines L1, L2, and L3 defined by x = 0, y = 0; x = 0, y = 4; x = 3, y

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Three infinite lines L1, L2, and L3 defined by x = 0, y = 0; x = 0, y = 4; x = 3, y = 4, respectively, carry filamentary currents –100 A, 200 A, and 300 A along az. Find the force per unit length on
(a) L2 due to L1,
(b) L1 due to L2
(c) L3 due to L1
(d) L3 due to L1 and L2. State whether each force is repulsive or attractive.