Question
Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current.
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Answer
Definition: One ampere is the value of steady current which when maintained in each of the two very long, straight, parallel conductors of negligible cross-section and placed one metre apart in vaccum, would produce on each of these conductors a force equal of 2 x 10-7 N/m of its length.
R = 1 meter and L = 1 meter, then
F= 2 x 10-7 N
Alternate Answer
If the student writes $\text{F} = \frac{\mu_{o}}{2\pi}\frac{\text{I}_{1}\text{I}_{2}}{\text{R}}\text{L}$ and says that when I1 = I2 = 1 ampereR = 1 meter and L = 1 meter, then
F= 2 x 10-7 N
Alternate Answer
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