Question
Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current.
✓
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 $2 \times 10-7 N/m$ of its length.
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 $I_1 = I_2= 1$ ampere
$R = 1$ meter and $L = 1$ meter, then
$F= 2 \times 10^{-7} N$
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 $2 \times 10-7 N/m$ of its length.
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 $I_1 = I_2= 1$ ampere
$R = 1$ meter and $L = 1$ meter, then
$F= 2 \times 10^{-7} N$
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