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. the statement which is most likely to be correct is?

P has only random error(s)

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Q has only systematic error(s)

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Q has both random and systematic errors

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P has both random and systematic errors

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Solution

The correct option is C Q has both random and systematic errors
Random errors are errors that vary from one measurement to another. Hence, both P & Q have random errors.

Systematic errors are errors that have non-zero mean. Hence, only Q has systematic errors.

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While experimentally verifying Ohm's Law, a student observed that the pointer of the voltmeter coincide with the 15th division when the voltmeter has a least count of 0.05V. Find the observed reading of the voltmeter. Answer with full explanations. (2 marks)
I am not able to solve this!!

Q. A galvanometer coil has a resistance

90 Ω

and full scale deflection current

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. A

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The correct option is C Q has both random and systematic errorsRandom errors are errors that vary from one measurement to another. Hence, both P & Q have random errors.Systematic errors are errors that have non-zero mean. Hence, only Q has systematic errors.

The correct option is C Q has both random and systematic errors
Random errors are errors that vary from one measurement to another. Hence, both P & Q have random errors.

Systematic errors are errors that have non-zero mean. Hence, only Q has systematic errors.