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NEET · Physics · Mathematics in Physics
Two students P and Q perform an experiment to verify Ohm's law for...
Two students and perform an experiment to verify Ohm's law for a conductor with resistance . They use a current source and a voltmeter with least counts of and , respectively. The plots of the variation of voltage drop across with current (I) for both are shown below
The statement which is most likely to be correct is:
The statement which is most likely to be correct is:
Options
- AP has only random error (s).
- B has only systematic error .
- C has both random and systematic errors.
- DP has both random and systematic errors.
Correct answer
D. P has both random and systematic errors.
Step-by-step solution
For student P:
Data points are scattered irregularly around the straight line → random errors present.
Also, the line does not pass exactly through the origin (expected for Ohm’s law) → systematic error present.
For student Q:
Data points lie almost exactly on a straight line with very small scatter → negligible random error, and systematic shift is absent.
Hence, P has both random and systematic errors → correct option is (4).