alleryStart learning →Two long wires 1 m apart each carry 1 A. The force per metre is:
A2 x 10^-7 N
B4 x 10^-7 N
C1 x 10^-7 N
D2 x 10^-5 N
Answer & Solution
Correct answer: A. 2 x 10^-7 N
Force per metre = 2 x 10^-7 x 1 x 1 / 1 = 2 x 10^-7 N, the basis of the ampere.
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