$20\,\mu A$ current flows for $30$ seconds in a wire, transfer of charge 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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