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Two parallel conductors carrying current...

Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit length between them is -

A

`6.4xx10^(-5)N//m`

B

`6.4xx10^(-2)N//m`

C

`4.6xx10^(-4)N//m`

D

`3.2xx10^(-4)N//m`

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