Basic series RLC circuit question

[Shweta_S]

Hey guys! Help me out with this one :-D :-D...

A series RLC circuit resonates at 1000kHz. At a frequency of 995kHz the circuit impedance is:
a) Resistive
b) Minimum
c) Inductive
d) Capacitive

 

[RCinFLA]

Is a capacitor with its leads (some small amount of series inductance due to leads) a capacitor at low frequency?

 

[Ratch]

Shweta_S,

Is the capacitive reactance higher or lower at the below resonance frequency? What about the inductive reactance?

Ratch

 

[Shweta_S]

I get that at a frequency less than a resonance frequency, the impedance would be capacitive. But isn't 995kHz too close to 1000kHz that impedance might be resistive??

 

[LvW]

I get that at a frequency less than a resonance frequency, the impedance would be capacitive. But isn't 995kHz too close to 1000kHz that impedance might be resistive??

At resonance, the resulting impedance is - of course - resistive (phase=0). That's the definition of resonance.
For decreasing frequencies below resonance the impedance gets more and more capacitive - however, of course not imaginary but with resistive losses.
For very small frequencies the phase of the current approaches +90 deg.