Question

Use the data of the figure (a). The current i in the circuit of the figure(b)

• A. -2 A
• B. 2 A
• C. -4 A
• D. +4 A

Answer 1

The correct option is C -4 A

This is a reciprocal and linear network. According to reciproity theorem which states "Two loops A and B of a network N and if and ideal voltage source E in loop A produces a current I in loop B, then interchanging positions an identical source in loop B produces the same current in loop A". Since network is linear, principle of homogeneity holds and so when volt sources is doubled, current also doubles with opposite direction.