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 electromotive force of a primary cell is 2 volts. When it is short-circuited it gives a current of 4 amperes. Its internal resistance in ohms is [MP PET 1995]
A) 0.5
B) 5.0
C) 2.0
D) 8.0
Correct Answer:
A
Solution :
\[E=V+ir\] After short-circuiting, \[V=0;\] Þ\[r=\frac{E}{i}=\frac{2}{4}=0.5\Omega \]