Networks Analysis and Synthesis - Engineering

Q1:

In an R-C circuit, the impedance is 40 Ω at a frequency of 100 Hz. At 200 Hz the impedance should be

A 40 Ω

B 80 Ω

C 20 Ω

D more than 20 Ω but less than 40 Ω

ANS:D - more than 20 Ω but less than 40 Ω

Since frequency is doubled, becomes one-fourth but R2 remains the same.