Two students $P$ and $Q$ perform an experiment to verify Ohm's law for a conductor with resistance $R$. They use a current source and a voltmeter with least counts of $0.1 \, mA$ and $0.1 \, mV$,respectively. The plots of the variation of voltage drop $V$ across $R$ with current $I$ for both are shown below. Which statement is most likely to be correct?

  • A
    $P$ has only random error$(s)$
  • B
    $Q$ has only systematic error$(s)$
  • C
    $Q$ has both random and systematic errors
  • D
    $P$ has both random and systematic errors

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