RLC AC Circuit: Frequency & Impedance

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Homework Help Overview

The discussion revolves around the concept of impedance in RLC AC circuits and its dependence on frequency. The original poster questions which circuits' impedance varies with frequency, specifically considering combinations of resistors, inductors, and capacitors.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to clarify their understanding of how impedance is affected by frequency in different circuit configurations. Some participants affirm that impedance does not depend on frequency for a resistor alone, while others explore related concepts involving magnetic fields and induced currents.

Discussion Status

The discussion includes affirmations of the original poster's thoughts regarding impedance and frequency. There is also a shift to a new topic concerning magnetic fields and induced current, indicating a branching of the conversation into related areas of physics.

Contextual Notes

The original poster expresses difficulty in finding relevant formulas in their textbook for the new question about magnetic fields and induced current, suggesting a potential gap in resources or understanding of the material.

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Homework Statement


For which of the following AC circuits does impedance depend on frequency? A circuit with
Check all that apply.
a resistor and inductor.
a resistor and capacitor.
only a resistor.



Homework Equations





The Attempt at a Solution


I think that for a capacitor and inductor the frequency would change the impedance but I am not sure?
thanks for any help.
 
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Impedance of the resistance only does not depend on the frequency.
 
so I was right----- thanks--slightly off topic but I have another question
"A circular wire loop of wire has radius 2.3cm and resistance 0.045ohms . A magnetic field is perpendicular to the loop.
At what rate must the field change in order to induce a current of 1.4mA in the loop"
ie. magnetic field/change in time?

I have been searching my textbook and can't find a formula that's relevant.
Would really appreciate some help.
 
Magnetic flux φ = EA, where E is electric field and A is the area of ring.

dφ/dt = A*dE/dt = V = IR.
 
Thanls a lot rl.bhat
 

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