In the given meter bridge configuration, initial null point occurs for l = 60 cm. If a resistance of 10 Ω is added in series to R1, null point shifts to 50 cm without any change in remaining circuit, then value of R1 is :
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a
60 Ω
b
50 Ω
c
40 Ω
d
Situation is not possible.
answer is D.
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Detailed Solution
On increasing resistance R1, the balancing length should increase. So the given situation is not possible.