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Electric circuits miscellaneous

  1. If two-port network shown in the given figure has the constant B =
    2s + 1
    s2

    then z(s) will be

    1. s
    2. 1
      s

    3. s + 1
    4. 1 +
      1
      s

Correct Option: B


If V2 = 0, then

I1(s) =
V1 (s)
Z (s)
+
1
Z (s) + 1s

and I2 (s) = I1 ×
1
=
V1(s).s
Z(s) + 1sZ(s) + [1 + Z(s)]

Given : B =
2s + 1
s2

V1(s)
=
sZ(s) + (1 + V(s))
=
2
+
1
I2(s)sss2

(s + 1)z(s)
=
(s + 1)
ss2

⇒ Z(s) =
1
s



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