An unknown resistance R 1 is connected in series with a resistance of 10 Ω Ω . This combinations is connected to one gap of a meter bridge while a resistance R 2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 Ω Ω resistance is removed the balance point shifts to 40 cm. The value of R 1 is (in ohm)
Text Solution
Verified by ExpertsThe correct answer is:
C
For first balancing condition 
⇒ ⇒ 
. For second balancing condition 
⇒ ⇒ 
⇒ ⇒ 
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