Force between the two parallel wires carrying currents has been used to define

ampere

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coulomb

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volt

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watt

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Solution

The correct option is A ampere
Ampere is defined as the constant current that will produce an attractive force of $2 \times 10^{- 7}$ newton per metre of length between two straight, parallel conductors( carrying the constant current) of infinite length and negligible circular cross section placed one metre apart in a vacuum. This is the Ampere's Force Law.

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How can we define an ampere using the concept of the force between two infinitely long parallel current carrying conductors?

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