Answer:
Explanation:
For a solid sphere; r > R
E = Q/4πεor^2
r = 9.25 cm = 0.0925m
plugging the values into the formula ;
Volume within sphere of radius 9.25 cm = 4/3π X (0.0925 m)^3
Charge per unit volume = 21.2/[4/3π X (0.0925m)^3] µC
= 6.39µC
By Coulomb's law,
the electric field = 9 X 10^9 X 6.39 X 10^-6/( 0.0925)^2
= 9 X 10^9 X 6.39 X 10^-6/0.0925^2
= 672.14KN/C
