A positively charged copper sphere of radius 10.2 cm is placed close to a negati

Question

A positively charged copper sphere of radius 10.2 cm is placed close to a negatively charged metal plate (see the figure below). The charge density is 1.08 10-7 C/m2 at a point on the sphere closest to the plate, and the potential at this point is Va = 50.5 V. What is the potential at a point on the opposite side of the copper sphere, where the charge density is zero?
http://www.cramster.com/answers-feb-11/physics/electric-potential-positively-charged-copper-sphere-radius-105-cm-plac_1129941.aspx?rec=0

Explanation / Answer

the sphere is a conducting object (copper), so it has the same potential at every point.
so its 50.5V

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