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NEET 2020 (Phase 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from NEET 2020 (Phase 1)

Q63NEET 2020 · PHASE 1Medium

Wheatstone Bridge & Metre Bridge

A resistance wire connected in the left gap of a metre bridge balances a 10 $\Omega$ resistance in the right gap at a point which divides the bridge wire in the ratio 3:2. If the length of the resistance wire is 1.5 m, then the length of 1 $\Omega$ of the resistance wire is:

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Answer: (a)

Balance: $\dfrac{R}{10} = \dfrac{3}{2} \Rightarrow R = 15\ \Omega$ .
$15\ \Omega$ of wire is 1.5 m long, so $1\ \Omega$ corresponds to $\dfrac{1.5}{15} = 0.1\text{ m}$ .
So the answer is (a) $1.0 \times 10^{-1}\text{ m}$ .

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