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July 29, 2015

Homework Help: Physics

Posted by Physics Lover on Thursday, June 13, 2013 at 4:45am.

Two fixed, non-conductive, isolated rings of radii 25 cm are electrified and brought close to each other so that they are parallel. The distance between them is 1 m. You know that one of them has a charge of 1 nC(Nano Coulomb) evenly distributed on it, but you are not sure about the other. In order to find out what's the charge on the other, you take a charged ball and move it across the axis of the rings until you find its equilibrium position. You measure where that is and get that the equilibrium position is 25 cm from the ring with the known charge. What's the charge in nC of the second ring?
Details and assumptions:
The second ring also has evenly distributed positive charge on it.

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