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Two long parallel wires carrying currents I₁ and I₂ in the SAME direction experience a force per unit length that is
AAttractive, magnitude μ₀ I₁ I₂ / (2π d)
BRepulsive, magnitude μ₀ I₁ I₂ / (2π d)
CZero
DAttractive, magnitude μ₀ I₁ I₂ d / (2π)
Answer & Solution
Correct answer: A. Attractive, magnitude μ₀ I₁ I₂ / (2π d)
Parallel currents attract, antiparallel repel; force per unit length = μ₀ I₁I₂/(2π d). This is the definition basis of the ampere historically.
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