Mean square radius uniformed charged sphere

AI Thread Summary
The discussion revolves around proving the mean square radius for a uniformly charged sphere with radius R. The original poster expresses confusion about how to start the proof and seeks guidance. They attempt an initial solution but find it unhelpful and unclear. Participants in the thread provide insights and methods to approach the problem, emphasizing the importance of integrating over the sphere's volume. The conversation ultimately aims to clarify the steps needed to derive the mean square radius effectively.
malawi_glenn
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Homework Statement



Hi i am going to proove that the mean square radius for a uniformed charged sphere is:

attachment.php?attachmentid=9385&stc=1&d=1173165159.jpg


For a sphere with radius R.

Homework Equations



So how do i do this? I have no idea where is should beging and so on.


The Attempt at a Solution



I thougth like this:

attachment.php?attachmentid=9386&stc=1&d=1173165457.jpg


But that makes no sense, i just know what the solotion is so.. help:frown:
 

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