Question

Calculate electric field at a distance of 40 cm from the centre of sphere of radius 15 cm 

carries a charge of 1.6 µc 

Answer 1

Gives

r=40cm

Q=1.6$\mu c$

R=15cm

$E=\frac{kQ}{r^2}$

$E=\frac{9\times10^{9}\times1.6\times10^{-6}}{0.4^2}$

$E=9\times10^4N/c$