Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
JEE Main & Advanced
Physics
Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
Question Bank
Kirchhoffs Law Cells
question_answer
The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is [SCRA 1998]
A) 2
B) 8
C) 10
D) 12
Correct Answer:
C
Solution :
In series \[i=\frac{nE}{nr+R}\] Þ \[0.6=\frac{n\times 1.5}{n\times 0.5\times 20}\]Þ n = 10