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: \[l={{l}_{2}}+{{l}_{3}}\] \[=2\,A+19\,A=21\,A\]
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