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MHT CET 2025 (23 Apr, Shift 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from MHT CET 2025 (23 Apr, Shift 1)

Q20MHT CET 2025 · 23 APR · SHIFT 1Medium

Wheatstone Bridge & Metre Bridge

The equivalent resistance of the following circuit when no current flows in the resistance of $5\ \Omega$ is nearly

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Answer: (b)

$\dfrac{10}{15} = \dfrac{20}{30}$ , so the bridge is balanced and $5\ \Omega$ carries no current.
Path ABC: $10 + 15 = 25\ \Omega$ ; path ADC: $20 + 30 = 50\ \Omega$
$R_{eq} = \dfrac{25 \times 50}{75} = 16.7 \approx 17\ \Omega$
So the answer is (b) $17\ \Omega$ .

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