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Obtain an expression for the force betwe...

Obtain an expression for the force between two straight parallel conductor carrying current. Hence define ampere.

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`F _(L) = (F)/(L) = (mu _(0))/( 2pi ) ((I _(1) I _(2))/( d ))`
Ampere: One ampere is that steady current which when flows through each of two infinitely long straight parallel conductors placed 1m apart in air, prodices a force of `2 xx 10 ^(-7) Nm ^(-1)` between the conductors.
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