Changing electric flux caused by a resistor

[TheLil'Turkey]

I'm learning the basics about electromagnetism, including that a changing electric flux through an open surface causes a magnetic field. Obviously a capacitor causes this, but doesn't a resistor like a light bulb (whose resistance varies with temperature and therefore time) also cause this?

 

[Antiphon]

Yes. Part of the magnetic field around the resistor comes from the current that flows through it. Another part comes from the time-changing electric field that spans it. You would model this as a capacitor in parallel with the resistor.

 

[TheLil'Turkey]

That makes sense. Thanks. I assume that the resistance of ALL resistors increases with increasing temperature. Is there a crude, classical physics model to understand why this is so?

 

[TheLil'Turkey]

I'm going to take a stab at answering my own question from post 3. I think that as the temperature goes up, the average distance an electron in a resistor travels before changing direction decreases because the atoms in the resistor are jiggling faster. Is that right?

 

[sardar]

Yes, a resistor like a light bulb can also cause a changing electric flux, which in turn can induce a magnetic field. This is because as the resistance of the light bulb changes with temperature and time, the electric current passing through it also changes, leading to a changing electric flux. Therefore, according to Faraday's law, a magnetic field will be induced around the resistor. This phenomenon is known as electromagnetic induction and is the basis for many electrical devices such as generators and transformers. It is important to understand the relationship between changing electric flux and magnetic fields in order to fully comprehend the principles of electromagnetism.