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What is the open circuit impedance Z11(s) of the network shown in the figure given above?
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- 10 + 2s
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10 - 4 
s
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10 + 4 s - 10 – 2s
Correct Option: A
The given network: 
Applying KVL in the input side
| V1 = l1 × 10 + l1 | = | + l2 | |||
| 1 | s | 1 | s | ||
| 4 | 4 |
or
| V1 = 10l2 + | l1 + l2 | ||
| s | s |
or
| V1 = I1 | | 10 + | | + | l2........(i) | ||
| s | s |
On comparing equation (i) with standard equation of Z-parameters, we get
| Z11 = 10 + | l2. . . . .. . . . (ii) | |
| s |
Hence alternative (C) is the correct choice.
