12 An isolated, irregularly shaped piece of platinum carries -8.61 x 109 Cof cha

Question

12

An isolated, irregularly shaped piece of platinum carries -8.61 x 109 Cof 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 pointon the surface (indicate one): O may equal V. O always differs from V. O equals 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 0. O may equal E always differs from E o equals E Calculate the potential at a distance of 6.81 m from the center of the charged piece of platinum Number

Explanation / Answer

this body's size is 4 mm ,so this will be treated as point size particle

potential at a different point on the surface is V = V

so the answer is equals V

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similarly the electric field equals E because this different point is also on the surface so the field and potential is same at different points on the surface
so the answer is equals E

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potential at 6.81 m is

V = k*Q/r = (9*10^9*8.61*10^-9)/(6.81) = 11.4 V

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