Question

Find the current through the 2Ω(c-d) resistor in the circuit shown below.

(a) 0.143

(b) 1.43

(c) 14.3

(d) 143

The question was asked during an online interview.

The origin of the question is Reciprocity Theorem topic in section Useful Theorems in Circuit Analysis of Network Theory

Answer 1

The correct choice is (b) 1.43

To explain: Total resistance in the circuit = 2+[3||(2+2│├|2)]=3.5Ω. The current drawn by the circuit  (It)=20/3.5=5.71Ω. The current drawn by 2Ω resistor = 1.43A.