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Wires carrying 10 A and 5 A lie 0.1 m apart in parallel. What is the force per metre?
A1 x 10^-5 N
B5 x 10^-4 N
C1 x 10^-3 N
D1 x 10^-4 N
Answer & Solution
Correct answer: D. 1 x 10^-4 N
F/L = mu0 I1 I2 / 2 pi d = 2 x 10^-7 x 50 / 0.1 = 1 x 10^-4 N/m.
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