A voltmeter having a resistance of $998\, ohms$ is connected to a cell of $e.m.f.$ $2\, volt$ and internal resistance $2\, ohm$. The error in the measurement of $e.m.f.$ will be
  • A$4 \times {10^{ - 1}}\,volt$
  • B$2 \times {10^{ - 3}}\,volt$
  • C$4 \times {10^{ - 3}}\,volt$
  • D$2 \times {10^{ - 1}}\,volt$
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