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How much force per unit length acts on a...

How much force per unit length acts on a long current carrying conductor X due to a current flowing through another similar conductor Y, kept parallel to it in vacuum ? Use this equation to define an ampere, the fundamental unit of current.

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Use the formula `(F)/(l)=((mu_(0))/(2pi))(I_(1)I_(2))/(R)` and define `1` ampere.
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