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Question 20181
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Magnetism: Force Between Parallel Wires MCQ

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Force Between Parallel WiresEasyQuestion 20181

Question

Force per unit length between two parallel wires carrying currents I₁ and I₂ separated by distance d is:
  1. A
    μ₀I₁I₂/2πd
    Correct
  2. B
    μ₀I₁I₂/d
  3. C
    μ₀I₁I₂d/2π
  4. D
    I₁I₂/2πd

Correct answer

μ₀I₁I₂/2πd

Explanation

F/L = μ₀I₁I₂/(2πd). This is the definition of the SI ampere when F/L = 2×10⁻⁷ N/m for two wires 1 m apart carrying 1 A each.

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