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In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 Ω resistor is connected in series with R 1 , the null point shifts by 10 cm. The resistance that should be connected in parallel with (R 1 + 10) Ω such that the null point shifts back to its initial position is : R 1 R 2 A B G ( )

1. 40 Ω
2. 30 Ω
3. 20 Ω
4. 60 Ω

Correct answer: 60 Ω

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