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Current Electricity
Potentiometer Principle / Balanced Circuit
1 question from 1 paper, each with its answer.
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Concepts tested
- null deflection in galvanometer
All Questions
2023 1 question
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If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:
No current in $G$ means the potential difference across $R$ is 2 V; $R=100\ \Omega$.
No current through 'G', so the potential difference across R is 2 V. $i=\frac{8}{400}$ $R=\left(\frac{2}{8}\times400\right)=100\ \Omega$