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?
KVPY 2017, Advanced
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(d)
For $P$ errors are both positive and negative.
For $Q$ errors are only positive.
So, $P$ has both random and systematic errors.
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