Flux density of solenoid beyond the pole

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SUMMARY

The discussion focuses on calculating the magnetic flux density (B) of a solenoid beyond its poles, specifically for determining the force exerted on an object at a distance. The participant initially references the equation B=(μNI)/L, which is applicable only at the center of the solenoid. However, they express confusion regarding the relevance of solenoid length (L) in the force equation F=BIL, as it appears to cancel out. A recommended resource for understanding the axial field of a solenoid beyond its ends is provided, confirming its utility for the participant's needs.

PREREQUISITES
  • Understanding of solenoid physics and magnetic fields
  • Familiarity with the equations F=BIL and B=(μNI)/L
  • Knowledge of magnetic permeability (μ) and its significance
  • Basic principles of electromagnetism
NEXT STEPS
  • Research the axial magnetic field of solenoids beyond the coil using specific resources
  • Study the effects of solenoid length on magnetic force calculations
  • Explore advanced topics in electromagnetism, such as Ampère's Law
  • Investigate practical applications of solenoids in engineering and physics
USEFUL FOR

Students and professionals in physics, electrical engineering, and anyone involved in designing or analyzing solenoids and their magnetic fields.

Jake110
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I’m making a solenoid and I’m trying to work out how much force it exerts on an object X meters away from it. I’m using F=BIL to get the force but I don’t know the equation for getting the magnetic flux density of the solenoid other than B=(uNI)/L but that’s just for the centre and I need it for outside the solenoid but in line for the object to get pulled towards one of the poles.

Although I’m not sure if B=(uNI)/L is the right equation because the L in that and the L in F=BIL will cancel out when putting them together and it doesn't make sense if the length of the solenoid has no effect on the force it exerts.
 
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yes, that is exactly what i was looking for, thank you.
 

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