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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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