$A$ current of $20\,\mu A$ flows for $30$ seconds in a wire. The total charge transferred will be:
- A$2 \times 10^{-4}\,C$
- B$4 \times 10^{-4}\,C$
- C$6 \times 10^{-4}\,C$
- D$8 \times 10^{-4}\,C$
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