In the potentiometer arrangement shown, the driving cell D has emf ε and internal resistance r. The cell C, whose emf is to be measured, has emf ε/2 and internal resistance 2r. The potentiometer wire is 100-cm long. If balance is obtained at the length AJ = λ .
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(b, c)
Potential gradient x = 
× 
Where R = resistance of potentiometer wire.
= x λ 
= 
× 
λ
λ = 
λ > 50 cm.
Balance length should be less than or equal to 100 cm
λ ≤ 100
≤ 100
R ≥ r
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