Posted by Stephanie on Tuesday, September 11, 2007 at 6:35pm.
A styrofoam ball covered with a conducting paint has a mass of 5.0 x 10 ^-3 kg and has a charge of 4.0 microcoulombs. What electric field directed upward will balance the weight of the ball?
Set the Coulomb force E*Q equal to the gravity force (weight), M g. Assume the charge is uniformly distributed around the surface. (This would be necessary since the surface is conducting). The sphere will behave as if it were a point charge of 4.0 microCoulombs at the center of the sphere.
Sorry (impatient) and Thank you for your time.
So is
E=/F/ divide by /q/
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