Calculating Magnetic Field of a Bar magnet

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SUMMARY

This discussion focuses on calculating the magnetic field of a bar magnet to determine the induced electromotive force (emf) in a hand crank generator. The generator design includes a strong rectangular magnet measuring 2"x1"x1" and a coil of wire. The formula for induced emf is provided as ε = NBω(2πRH)sin(ωt), where N is the number of turns, B is the magnetic field, ω is the angular speed, R is the radius, H is the height, and t is time. The user seeks assistance specifically in calculating the magnetic field from the given parameters.

PREREQUISITES
  • Understanding of electromagnetic induction principles
  • Familiarity with the formula for induced emf
  • Basic knowledge of magnetism and magnetic field calculations
  • Experience with hand crank generator design
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  • Research methods for calculating the magnetic field of a rectangular bar magnet
  • Explore the effects of angular speed on induced emf in generators
  • Learn about the relationship between magnetic pull force and magnetic field strength
  • Investigate practical applications of hand crank generators in energy generation
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Engineers, physics students, hobbyists designing generators, and anyone interested in the principles of electromagnetism and energy conversion.

Xyius
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I am trying to calculate the theoretical induced emf of a hand crank generator I am going to make. The generator will have a rotating magnet inside a coil of wire. The magnet will be fairly strong.

Magnetic Pull Force: 146 lbs
Magnet Dimentions: 2"x1"x1" rectangular block

Is is possible to calculate the magnetic field from this data? I have already calculated that the induced emf in the coil will be..

ε = NBω(2πRH)sin(ωt)
N=Number of turns in the coil of wire
B=Magnetic Field
ω=Angular speed
R=Radius
H=height
t=time

The only thing I don't have to calculate the induced emf is the magnetic field. I don't know much about calculating this type of thing, I know it can be tricky. Thanks!

EDIT:
The poles of the bar magnet are on the 2" x 1" faces
 
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Can anyone help me out? No one?
 

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