alleryStart learning →The SI ampere is defined using parallel wires 1 m apart in vacuum with a force per metre of:
A2 x 10^-7 N
B4 pi x 10^-7 N
C1 x 10^-7 N
D2 pi x 10^-7 N
Answer & Solution
Correct answer: A. 2 x 10^-7 N
Two infinite parallel wires 1 m apart carrying 1 A each experience 2 x 10^-7 N per metre of length.
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