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The driving point impedance of the infinite ladder network shown in the figure is (Given : R1 = 2 Ω and R2 = 1.5 Ω)
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- 3 Ω
- 3.5 Ω
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3 Ω 3.5
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ln 
1 + 3 
Ω 3.5
- 3 Ω
Correct Option: B
| Req = R1 + | ||
| R1 + R2 + Req |
⇒ Req. R1 + Req. R2 + Req 2 = R1 2 + R1 R2 + Req R1 + R1 R2 + Req . R2
⇒ Req = √R1 ² + 2 R1 R2
= √4 + 2 . 2 . 15
= √10 = 3.5 Ω
