Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?
Correct answer: D. 0.1 N
- A. 100 N
- B. 10 N
- C. 1 N
- D. 0.1 N
Explanation
For two parallel conductors, force per metre is F/L = μ₀I₁I₂/(2πd). Substitution gives (4π × 10⁻⁷ × 100 × 100)/(2π × 0.02) = 0.1 N/m.
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