An isolated, irregularly shaped piece of platinum carries -8.91 x109 C of charge

Question

An isolated, irregularly shaped piece of platinum carries -8.91 x109 C of charge and is in electric equilibrium. The size of this body is about 4 mm. When the electric potential at some point on the metal's surface has the value V the potential at a different point on the surface (indicate one): O always differs from V O equals V O may equal V When the electric field strength at some point on the body's surface has the value E, the field strength at a different point on the surface (indicate one): O equals E O always differs from E O may equal E O equals 0 Calculate the potential at a distance of 6.15 m from the center of the charged piece of platinum. Number

Explanation / Answer

a)

Equals V

b)

May equal E

c)

Electric potential due to point charge is given by

V=KQ/r =(9*109)(-8.91*10-9)/6.15

V=-13.04 Volts

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