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  4. 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. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/5f76e35e1d850ec966ef41768fd131d0-.jpeg /> The statement which is most likely to be correct?

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Q. 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.
image
The statement which is most likely to be correct?

KVPYKVPY 2017Physical World, Units and Measurements

Solution:

For $P$ errors are both positive and negative. For $Q$ errors are only positive. So, $P$ has both random and systematic errors.