question_answer

The figure below shows currents in a part of electric circuit. The current i is                          [CPMT 1981; RPET 1999]

A)                    1.7 amp

B)                    3.7 amp

C)                    1.3 amp

D)                    1 amp

Correct Answer: A

Solution :

           According to Kirchhoff's first law At junction A, \[{{i}_{AB}}=2+2=4A\] At junction B, \[{{i}_{AB}}={{i}_{BC}}-1=3A\] At junction C, \[i={{i}_{BC}}-1.3=3-1.3=1.7\,amp\]