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Networks Analysis and Synthesis
The impedance of an RC series circuit is 12 Ω at f= 50 Hz. At f= 200 Hz, the impedance will be
more than 12
less than 3
more than 3 Ω but less than 12 Ω
more than 12 Ω but less than 24 Ω
Correct Answer:
more than 3 Ω but less than 12 Ω
Explanation:
Z =
R
2
+ X
C
2
. When
f
is made four times, X
C
becomes one-fourth but R remains the same.
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