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
Heating Effect of Current
question_answer
Electric bulb 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, 10 W. Maximum number of bulbs that can be connected so that they glow in full power is [CPMT 2002]
A) 2
B) 8
C) 4
D) 6
Correct Answer:
C
Solution :
When each bulb is glowing at full power, Current from each bulb \[=i'=\frac{50}{100}=\frac{1}{2}A\] So main current \[i=\frac{n}{2}A\] Also \[E=V+ir\] Þ \[120=100+\left( \frac{n}{2} \right)\times 10\Rightarrow n=4\]