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Force per unit length between parallel currents Ia and Ib a distance d apart is
Aμ0 Ia Ib / 2πd
Bμ0 Ia Ib d / 2π
Cμ0 Ia Ib / 2πd^2
Dμ0 Ia Ib / 4πd
Answer & Solution
Correct answer: A. μ0 Ia Ib / 2πd
Wire a's field μ0 Ia / 2πd acts on a unit length of b carrying Ib, giving μ0 Ia Ib / 2πd.
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