Electric field intensity (E) at a distance (d) from the centre of a sphere containing net charge q is given by the relation,
Where, q = Net charge = 1.5 × 103 N/C
d = Distance from the centre = 20 cm = 0.2 m
εo = Permittivity of free space and 1/4πεo=9×109 Nm2C−2
Therefore,
q=E(4πεo)d2=1.5×103/9×109
= 6.67 × 109 C
= 6.67 nC
Therefore, the net charge on the sphere is 6.67 nC.
