The factors in this system that would generate CEMF

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Counter-EMF (CEMF) in a solenoid system is primarily generated by the motion of a stationary magnet within it, as well as the inductance of the coil. When the solenoid is powered on or off, the change in current creates a variation in the magnetic field, leading to induced EMF that opposes the applied voltage. The initial voltage spike occurs as the current through the coil cannot change instantaneously, resulting in a brief higher voltage before stabilizing. This behavior is fundamentally linked to the principles of inductance, where the opposing EMF arises from changes in magnetic flux. Understanding these dynamics is crucial for analyzing the system's electrical behavior.
Wiz700
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Hi

I have a Solenoid(No core) and a small magnet that is stationary in it.
The Solenoid is powered off/on. What would cause Counter-EMF if the Solenoid is on/off?
Only the motion of the magnet?

What are other factors would generated EMF in my coil?
Other than the magnet's motion + the power input of course :P
 
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The inductance of the coil perhaps.
 
CWatters said:
The inductance of the coil perhaps.

Do explain!
 
Another thing, the motion of the magnet is a result of the attraction or repulsion of the two.
Only AFTER the force is applied the motion starts. So CEMF is a result of the reaction, well on of the results motion is too a result :)

In fact! Motion is a result of the magnet + electromagnet's attraction/repulsion and CEMF is a result of that motion.
 
Wiz700 said:
Do explain!

When turned on the current through the coil inductance can't change instantly. The coil voltage will initially be higher. As the current builds the voltage will fall to it's final value. During that (brief?) time the voltage is higher than normal. Can that be distinguished from CEMF?
 
Well I just learned "Inductance" as: The opposing EMF that is generated by changing current, thus caused a change in the magnetic field = change in the magnetic flux thus INDUCED EMF opposes the applied EMF.

I assume this is what you meant? "L"?
 
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