How the solenoid gets the linear motion when the current is passed in the coil?

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Discussion Overview

The discussion centers on the mechanics of how a solenoid generates linear motion when current is passed through its coil. It explores the principles behind the magnetic field produced and its interaction with a rod, as well as the application of rules related to electromagnetism.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant describes the use of solenoids in pneumatic controllers, noting that current through the coil generates a magnetic field but seeks clarification on how this field moves the solenoid rod.
  • Another participant explains that when the coil is energized, the magnetic field creates a force on a ferromagnetic rod, moving it into the coil, and mentions that reversing the current can reverse the direction of the force if the rod is a permanent magnet.
  • A participant questions whether the phenomenon is based on Fleming's Left Hand Rule.
  • Another participant suggests that it relates to the right-hand rule of a screw thread.

Areas of Agreement / Disagreement

Participants express different views on the rules that apply to the motion of the solenoid rod, indicating that there is no consensus on which rule is the correct one to reference.

Contextual Notes

Some assumptions about the nature of the rod (ferromagnetic vs. permanent magnet) and the specifics of the solenoid's design may affect the discussion but remain unresolved.

Raj
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The Solenoids which are used for pneumatic controller uses the solenoid as a switch to control the value opening and closing. This is done by passing current to through the coil which produces the magnetic field . But i would like to know how the generated magnetic field will move the solenoid rod?
 

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When the coil is energized, a magnetic field is created. This field produces a force that acts on the ferromagnetic rod and moves it into the coil up to a certain allowed point. If the rod is a permanent magnet reversing the current direction in the coil reverses poles of the electromagnet and produced force can be in oposite direction to push out the rod.
 
Is it based on Flemings Left hand rule ?
 
Right hand rule of a screw thread. I think that's the name
 

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