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An isolated conducting sphere whose radius R=1 metre  has charge q=1/ 9 nc ( 1 divide 9) . The energy density at the surface  of sphere is (in joule per metrecube)

(A) ε0/2               (B)ε0

(C)2ε0                (D)ε0/3


6 years ago


Answers : (1)


energy density is  given by 1/2 f silen not E^2  where E is the electric field at the surface.


E= q^2 /( 4 pief silen not r^2)


where r is the radius of the conductor

put values and obtain ans

6 years ago

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