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Question
Draw the effective equivalent circuit of the circuit shown in figure, at very high frequencies and find the effective impedance.
Solution
The element with infinite resistance will be considered as open circuit and the element with zero resistance will be considered as short-circuited.
In similar way, `X_C = 1/(2pivC)`
At high frequency, XC will be low.
So reactance of capacitance can be considered negligible and capacitor can be considered as short-circuited.
Here the above figure is equivalent circuit to given circuit.
Total impedance,Z = R1 + R3
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