Effect of current induced by rod magnet

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Discussion Overview

The discussion revolves around the effect of a rod magnet rolling down an inclined solenoid on the induced current within the solenoid. Participants explore the implications of the geometry and configuration of the solenoid, as well as the behavior of the magnet as it moves through the solenoid.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the clarity of the geometry described and asks for more details about the solenoid's wiring configuration and the orientation of the magnet.
  • Another participant agrees that the initial question lacks clarity.
  • A different participant asserts that a rod magnet rolling down the solenoid will not induce any voltage or retarding force, arguing that the magnet's ends are at the same axial position within the solenoid at any given time, thus leading to no braking or acceleration.
  • This participant also notes that if the solenoid is connected to a load, a longer magnetized rod would induce voltage pulses and create a retarding force, but this does not apply to the short rod in the described scenario.

Areas of Agreement / Disagreement

Participants express uncertainty about the clarity of the initial question and the geometry involved. There is disagreement regarding whether the rod magnet induces any current or force while rolling down the solenoid, with one participant providing a specific argument against the induction of current in this case.

Contextual Notes

The discussion highlights the importance of the solenoid's wiring configuration and the length of the magnet in determining the induced effects, which remain unresolved due to differing interpretations of the scenario.

Who May Find This Useful

This discussion may be of interest to individuals exploring electromagnetic induction, the behavior of magnets in conductive environments, or those studying the effects of geometry on induced currents in solenoids.

Lesnick
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If you had a lined retangular section solenoid inclined at a angle of 45 deg and you rolled a rod magnet ( just fits inside the retagular section) down it. Would the current induced in the solenoid brake or accelerate the rod magnet.
 
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Lesnick said:
If you had a lined retangular section solenoid inclined at a angle of 45 deg and you rolled a rod magnet ( just fits inside the retagular section) down it. Would the current induced in the solenoid brake or accelerate the rod magnet.

Welcome to the PF.

I'm not sure that I understand the geometry that you are describing. Also, what is the solenoid wiring connected to? Is there a load resistor, is it shorted end-to-end, or is it open circuit? Could you maybe post a sketch/drawing? I'm assuming the bar magnet has N at one end and S at the other end, right?
 
yep the question isn't clear..
 
There are several things going on here. The final answer is: no braking and no acceleration.

Assume a solenoid wound around a non-conducting rectangular form sloped at 45 degrees. A long magnetized rod magnetized end to end pulled or pushed through the solenoid will induce voltage pulses in the coil. If the ends of the solenoid are connected to a load, there will be a retarding force due to induced current. However, if a short rod magnetized end to end and rolling down the solenoid, will not induce a voltage, nor any retarding force. This is because both magnetized ends are at the same axial position of the solenoid at any instant in time.

Bob S
 

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