Hi guys, need some help with this question thanks! Consider a ring of radius R w

Question

Hi guys, need some help with this question thanks! Consider a ring of radius R with the total charge Q spread uniformly over its perimeter. What is the potential difference between the point at the center of the ring and a point on its axis a distance 2R from the center? How many electrons should be removed from an initially uncharged spherical conductor of radius .300m to produce a potential of 7.5kv at the surface?

Explanation / Answer

follow this V = kq/r => q = Vr/k = 5000 * 0.3 / 9 x 10^9 C = (5/3) x 10^-7 If n = no. of electrons to be removed n x 1.6 x 10^-19 = (5/3) x 10^(-7) => n = (5/4.8) x 10^12 electrons = 1.0412 x 10^12 electrons. [This will leave an equal amount of positive charge in protons and produce the give potential on the surface of the sphere.]

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