Question

Calculate the electric field strength at distance of 3 m from a charge of 32n C placed in air.

Answer 1

Given `q = + 32 nC = 32 xx 10^(-9) C`
`r = 3 m`
`E= (1)/(4piin_(0)) Q/(r^(2)) = 9 xx 10^(9) xx (32 xx 10^(-9))/((3)^(2)) = 32 N C^(-1)`, which is away from the charge.