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Define th SI unit of electric current. (...

Define th SI unit of electric current. (or) What is one second in SI system of units? (or) Define one ampere (S.I standard for current)

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The SI unit for electric current is ampere (A)
Definition:
One ampere is theconstant current, which when maintained in each of the two straighte parallel conductors of infinite length and negligible cross section, held one metre apart in vacuum shall produce a force per unit length of `2xx10^(-7)` N/m etween them.
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