The resistance of the meter bridge AB in given figure is 4 Ω Ω . With a cell of emf ε = 0.5 V and rheostat resistance R h = 2 Ω Ω the null point is obtained at some point J. When the cell is replaced by another one of emf ε = ε 2 the same null point J is found for R h = 6 Ω Ω . The emf ε 2 is:
Text Solution
Verified by ExpertsThe correct answer is:
B
In circuit, when R h = 2 Ω Ω
i 1 = 
, ε = 
× AJ
AJ = 
…..(i)
when R h = 6 Ω Ω
i 2 = 
ε 2 = 
AJ = 
…..(ii)
From (i) & (ii)
ε 2 = 0.6 × ε
= 0.6 × 0.5 = 0.3V
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