Correct set up to verify Ohm's law is
JEE MAIN 2013, Diffcult
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In ohm's law, we check $\mathrm{V}=$ $IR$ where $I$ is the corrent flowing through a resistor and $V$ is the potential difference across that resistor.
Only option $(a)$ fits the above criteria.
Remember that ammeter is connected in scries with resistance and vditmeter parallel with the resistance.
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