question_answer

The value of current I in figure is :

A)  4 A                                        

B)  6 A

C)  3 A                                        

D)  5 A

Correct Answer: A

Solution :

                 From Kirchhoffs first law, in an electric circuit the algebraic sum of the currents meeting at any junction is zero, i.e.,              \[\Sigma i=0\] \[\therefore \]Taking inward direction of current as positive and outward as negative, we have                 \[1A-3A-2A+I=0\] \[\Rightarrow \]               \[I=4A\]