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Derive an expression for the force betwe...

Derive an expression for the force between two long parallel current carrying conductors. Use this expression to define SI unit of current.

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One ampere of current can be defined as the amount of current which when flowing ( in same direction) through two infinitely long parallel wires separated by one metre produces an attractive force of `2xx10^(7) Nm^(-1)`. The wires must have negligible circular cross-section and they must be placed in vaccum.
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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII BOARDS-SET-I
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