alleryStart learning →The ampere is defined by the force per metre between two long wires 1 m apart, namely
A1 x 10^-7 N
B2π x 10^-7 N
C2 x 10^-7 N
D4π x 10^-7 N
Answer & Solution
Correct answer: C. 2 x 10^-7 N
Two infinitely long wires 1 m apart each carrying 1 A attract with 2 x 10^-7 newton per metre.
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