Which of the following is not a unit of charge ?

coulomb

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ampere-second

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microcoulomb

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ampere/second

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Solution

The correct option is D ampere/second
(i) The charge unit coulomb
(ii) $q = i t =$ ampere $\times$ second
(iii) micro coulomb (because $s$ prefix only is added)
(iv) ampere/second $\to$ it is not unit of charge.

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