Current Electricity Charging Discharging Of Capacitors Question 622
Question: 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]
Options:
A) 2
B) 8
C) 10
D) 12
Show Answer
Answer:
Correct Answer: C
Solution:
In series $ i=\frac{nE}{nr+R} $
Therefore $ 0.6=\frac{n\times 1.5}{n\times 0.5\times 20} $
Therefore n = 10
BETA
