When a current of 2 A flows in a battery from negative to positive terminal, the potential difference across it is 12V. If a current of 3 A flowing in the opposite direction produces a potential difference of 15 V, the emf of the battery is
Text Solution
Verified by ExpertsThe correct answer is:
B
Let 
be emf and r be internal resistance of the battery.
In first case,
…(i)
In second case,
Subtract (ii) from (i), we get …(ii)
Putting this value of r in eqn. (i), we get
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