Topic: Network Theory
The approximate equivalent resistance at the points $X_{1}$ and $X_{2}$ in the circuit shown in below (A ladder network with series 10 $\Omega$ resistors and parallel 40 $\Omega$ resistors)
- A. 60 $\Omega$
- B. 40 $\Omega$
- C. 80 $\Omega$
- D. 20 $\Omega$
Answer: B. 40 $\Omega$
Explanation: Evaluating the resistive ladder network starting from the far right end, the series and parallel combinations simplify step-by-step. The equivalent resistance across the input terminals $X_{1}$ and $X_{2}$ is 40 $\Omega$.