Ques. 1AIPMT 2000
A car battery of emf 12 V and internal resistance 5 10-2 , receives a current of 60 amp, from external source, then terminal potential difference of battery is
- 12 V
- 9 V
- 15 V
- 20 V
Answer
(3) 15 V
Solution
The battery receives current from an external source, i.e. it is being charged (current enters at the positive terminal).
While charging: V = E + Ir
= 12 + 60 5 10-2
= 12 + 3 = 15 V
Answer: (3)