Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
12th Class
Physics
Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर
Question Bank
Case Based (MCQs) - Current Electricity
question_answer
The value of l in the figure shown is:
A)19 A
B) 21 A
C)4 A
D)8 A
Correct Answer:
B
Solution :
(b) 21 A Using Kirchhoff's first law: At junction a: \[{{l}_{1}}=20-5=15\,A\] At junction b: \[{{l}_{3}}={{l}_{1}}+4\] \[\therefore {{l}_{3}}=15+4=19\,A\] At junction c: \[{{l}_{2}}=5-3=2\,A\] At junction d: \[l={{l}_{2}}+{{l}_{3}}\] \[=2\,A+19\,A=21\,A\]