The efficiency of a cell when connected to a resistance R is 60%. What will be its efficiency if the external resistance is increased to six times.
Text Solution
Verified by ExpertsThe correct answer is:
B
η = 
1 – 
= 0.6
⇒ R = 0.6 r + 0.6 R
r = 
R = 
η = 
= 0.9 = 90%
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