Physics · Least count, significant figures, Errors in measurements
Two students and perform an experiment to verify Ohm's law for a conductor with
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 \( 0.1 \mathrm{mA} \) and \( 0.1 \mathrm{mV} \) respectively. The plots of the variation of voltage drop(V) across R with current(i) for both are shown. the statement which is most likely to be correct is?
- 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
Step-by-step solution
The least counts introduce random errors due to reading uncertainties. If Q's plot shows a systematic offset (e.g., not passing through origin) along with scatter, it indicates both random and systematic errors. P's plot likely shows only random scatter around a line through the origin.
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