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A spherical conductor of radius 12 cm ha...

A spherical conductor of radius 12 cm has a charge of `1.6xx10^-7C` distributed uniformly on its surface. What is the electric field.
(a) inside the sphere
(b) just outside the sphere
(c) At a point 18 cm from the centre of the sphere ?

Text Solution

Verified by Experts

(a) Here `r=12cm=12xx10^-2m`,
(b) Just coincide the sphere (say on the surface of the sphere)
`E=(q)/(4pi epsi_0r^2)`
`=9xx10^9xx(1.6xx10^-7)/((12xx10^-2)^2)=10^5N//c`
(c) At `r=irm =18xx10^-2`
`E=(q)/(4piepsi_0r^2)=(9xx10^9xx1.6xx10^-7)/((18xx10^-2)^2)`
`4.4xx10^4N//c`.
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