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Question

For the system shown in figure below, what is the transfer function Vo(s)Vi(s)?


A
Vo(s)Vi(s)=sLs2RLC+sL+R
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B
Vo(s)Vi(s)=sLRs2RLC+sLR+R
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C
Vo(s)Vi(s)=s2Ls2RLC+2sL+1
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D
Vo(s)Vi(s)=ss2RLC+sL+R
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Solution

The correct option is A Vo(s)Vi(s)=sLs2RLC+sL+R
Applying Laplace transform and taking the parallel combination of L and C gives LsCsLs+1Cs

Applying voltage division rule we get, Vo(s)=L/CLs+1CsR+L/CLs+1CsVi(s)

Vo(s)Vi(s)=sLs2RLC+sL+R

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