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Finding the mass of a sphere with uniform charge density

  • Thread starter ghost34
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Homework Statement


The sphere has radius R, and uniform volume charge density P. This sphere remains stationary (levitates) when placed above an infinite sheet of paper with a uniform surface charge density u. What is this sphere's mass?


Homework Equations


4/3 pi R^3 is the volume of a sphere
F=ma

The Attempt at a Solution


The only connection between mass and the charged situation I can see is with the Force=ma law, but as there isn't any acceleration, I can't figure out how to solve for m...any help would be appreciated, thanks
 
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Answers and Replies

  • #2
3,812
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To remain stationary, the net force on the ball should be zero. What are the forces acting on the ball?
 

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