In the experimental set up of meter bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 Ω 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 Ω such that the null point shifts back to its initial position is:
Text Solution
Verified by ExpertsThe correct answer is:
A
= 1
R 1 + 10 = R 2
R 1 + 10 = 
R 1
10 = 
R 1 , R 1 = 20 Ω Ω
⇒ ⇒ 3R = 2R 1 + 20 + 2R
R = 2R 1 + 20
R = (40 + 20) Ω Ω = 60 Ω Ω
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