Solenoid (single or multi turn) and forces

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Discussion Overview

The discussion revolves around the behavior of a solenoid, particularly when it produces a very high magnetic field. Participants explore the implications of high current and its effects, including potential overheating and structural integrity, while seeking calculations and references related to these phenomena.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the forces acting on a solenoid when it generates a high magnetic field and expresses uncertainty about the calculations involved.
  • Another participant suggests that the high magnetic field leads to high current, which generates heat and could cause an explosion, indicating that calculations depend on resistance, thermal conductivity, and melting points.
  • Some participants argue that the effects are primarily due to heating from the current rather than the magnetic field itself, requesting references for this claim.
  • A later reply mentions that solenoids designed for high fields often have structural components to maintain integrity, implying that magnetic field effects should not be disregarded.
  • One participant presents a detailed calculation involving current, resistance, and thermal properties of the conductor, concluding that the resulting temperature increase is significant.

Areas of Agreement / Disagreement

Participants express differing views on whether the magnetic field itself contributes to the potential for explosion, with some emphasizing the role of heating due to current. The discussion remains unresolved regarding the extent of the magnetic field's impact.

Contextual Notes

Participants reference various factors such as resistance, thermal conductivity, and material properties, but there is no consensus on how these relate to the magnetic field's effects. The calculations presented rely on specific assumptions about the system's parameters.

1Keenan
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Hi all,

I need help in understand what happen when a coil, let's say a solenoid with N turn (N = 1 or whatever) produces a very high magnetic field.
I know that the solenoid could explode, this means that there are forces on it, and I don't know how to calculate.
Can somebode helps me?
Can you provide any reference for this calculation?

Thank you
 
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You told that B is high hence i is high.consequently more heat is generated which causes explosion. As far as calculations are concerned it depends on resistance, thermal conductivity and Melting point of the material.
 
so it does not depends on the magnetic field itself, but on the heating due to the current...
Can you please provide some reference?
 
1Keenan said:
so it does not depends on the magnetic field itself, but on the heating due to the current...
Can you please provide some reference?
Yes. You can refer any high school book on electrodynamics.And if you want formulas search "magnetic field due to current carrying coil"and "heating effects of current".
Hope it helps[emoji106]
 
thank you

but are you sure that there is no effect due to the magnetic field?
I mean solenoids for high field usually have a bulk to keep the structure all together, even if they don't melt
 
Hi again,

can you check this calculation, please?
I have:
Current (FWHM): I=2e5A
time of current pulse (FWHM) t=3nsec

For the conductor:
Resistance: 0.018473 Ohm
Volume: Vol=0.932 mm3
Mass: M=8.313e-6 Kg
Specific heat: Cs = 385 J7(Kg*Kekvin) [Specific heat of Copper]

I calculate:

Power: P=R*I^2=7.39e8 Watt
Heat (Joule): Q = P*t=2.217J
Termal Jump: DT = Q / (Cs*Mass) = 692.6 K

I see that temperature is crazy...
 

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