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NEET 2023 · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from NEET 2023

Q38NEET 2023Easy

Wheatstone Bridge & Metre Bridge

If the galvanometer $G$ does not show any deflection in the circuit shown, the value of $R$ is given by:

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Answer: (b)

No current through G, so the p.d. across R equals the 2 V cell.
The 10 V cell sends current through 400 $\Omega$ and R in series: $\frac{10R}{400 + R} = 2$
$10R = 800 + 2R \Rightarrow R = 100\ \Omega$
So the answer is (b) $100\ \Omega$ .

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