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54. Electric currents I1 and I2 are flowing through two parallel electric wires which are separated apart by a distance R. What is the force per unit length between the two parallel wires? (Magnetic constant is μ0)
(A)
(B)
(C)
(D)
(E)



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54. Electric currents I1 and I2 are flow..-阿摩線上測驗