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There are 3 parallel wires which are spaced D=4cm. They lie on the same plane. Each Carries a steady current . What is the magnetic force per unit length on the middle wire. Units for the options below are μN/m.

a. 40 to the left

b. 40 to the right

c. 20 to the left

d. 20 to the right

E. 0

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