1.

A spherical conductor of radius 2 cm is uniformly charged with 3 nC. What is the electric field at a distance of 3 cm from the centre of the sphare ?

Answer»

`3 XX 10^(6)V m^(-1)`
`3 Vm^(-1)`
`3 xx 10^(4) Vm^(-1)`
`3 xx 10^(-4) V.m^(-1)`

Solution :`E = 9 xx 10^(9) xx (Q)/(r^(2)) ""(because E = (1)/(4pi epsilon_(0))(q)/(r^(2)))`
`E = (9 xx 10^(9) xx3 xx 10^(-9))/((3 xx 10^(-2))^(2)) = 3 xx 10^(4) V//m`


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