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JEE Main 2019 (10 Apr, Shift 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from JEE Main 2019 (10 Apr, Shift 1)

Q69JEE Main 2019 · 10 APR · SHIFT 1Medium

Wheatstone Bridge & Metre Bridge

In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure

Which of the readings is inconsistent?

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Answer: (a)

$X = R\,\dfrac{100-l}{l}$ for each reading.
1: $1000 \times \frac{40}{60} = 667\ \Omega$ ; 2: $100 \times \frac{87}{13} = 669\ \Omega$ ; 3: $10 \times \frac{98.5}{1.5} = 657\ \Omega$ .
4: $1 \times \frac{99}{1} = 99\ \Omega$ , far from the others.
So the answer is (a) reading 4.

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