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In the circuit given below, the current in the 4-ohm resistor is __________(a) 3.5 A(b) 2.5 A(c) 1.5 A(d) 0.5 AI got this question during an internship interview.My question is based upon Advanced Problems on Reciprocity Theorem in division Useful Theorems in Circuit Analysis of Network Theory

Answer»

The CORRECT choice is (c) 1.5 A

For explanation I would SAY: RTH = [(2+4) || 6] + 12 = 15 Ω

IS = \(\frac{45}{15}\) = 3 A

Now, by current division rule, we GET, I = \(\frac{3 × 6}{12} = \frac{18}{12}\) = 1.5 A.



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