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RC Circuits - Engineering

Q1:

When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

A increases

B decreases

C does not change

D decreases to zero

ANS:A - increases

Z = 1/√(1/R)^2+(WC)^2.

WC = 2πfC.

As f dec, the term (WC)^2 dec and as a result, overall denominator decreases, ultimately Z increases.