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. The statement which 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
KVPY 2017, Advanced
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