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hansbahia
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Homework Statement
A sphere magnet of radius a has permanent uniform magnetization, z-axis. So we were trying to find the magnetic field at the center of the magnet in class.
Homework Equations
[itex]j_M(θ)=Msin(θ)[/itex]
[itex]dI=j_M(θ)adθ[/itex]
circular loop
[itex]r_{loop}=asin(θ)[/itex]
The Attempt at a Solution
When using Biot-Savart equation for magnetic field of a ring why do you use*
[itex]R^3=(a^2+z^2)[/itex]
instead of
[itex]R^3=(r_{loop}^2+z^2)[/itex]
for the denominator?
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