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In the definition of the ampere, each of two long parallel wires 1 m apart experiences what force per metre?
A4 x 10^-7 N
B2 x 10^-5 N
C2 x 10^-7 N
D1 x 10^-7 N
Answer & Solution
Correct answer: C. 2 x 10^-7 N
Using mu0 I1 I2 / 2 pi d with 1 A, 1 A and 1 m gives 2 x 10^-7 N per metre.
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