Question

Derive an expression of
force per unit length between
two long straight parallel
current carrying conductors,
Hence, define one ampere,
​

Answer 1

Explanation:

1 ampere is the value of that 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 vacuum, would produce on each of these conductors a force equal to 2 × 10−7 Newton per metre of length

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