Two resistances are connected in two gaps of a meter bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is
Text Solution
Verified by ExpertsThe correct answer is:
C
Let S be larger and R be smaller resistance connected in two gaps of meter bridge
∴ ∴ 
.....(i)
When 
resistance is added to resistance R, then
.... (ii)
From equations (i) and (ii) 
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