Question

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 $0.1mA$ and $0.1mV$, 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

Answer 1

Answer: (D)

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