alleryStart learning →Two wires 0.2 m apart carry 20 A and 30 A. What is the force per metre?
A3 x 10^-4 N
B1.2 x 10^-3 N
C6 x 10^-4 N
D6 x 10^-3 N
Answer & Solution
Correct answer: C. 6 x 10^-4 N
F/L = 2 x 10^-7 x 20 x 30/0.2 = 6 x 10^-4 N per metre.
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