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RC Circuits - Engineering

Q1:

When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

A increases

B decreases

C remains the same

D doubles

ANS:A - increases

Z = R-jXc
= R-j/2*π*f*C.

Now as f decrease, Xc will increase.
As a result whole impedance Z= √(R^2+Xc^2) will also increase.