Answer:
Q = 28.17 x 10⁻¹⁰ C
E= 375 N/C
Explanation:
Let Q be the charge on plastic sphere.
Field on the surface =k x charge / radius²
Putting the values we get
[tex]1500=\frac{9\times10^9\times Q}{(13\times10^{-2)^2}}[/tex]
Q = 28.17 x 10⁻¹⁰ C
No of electrons = Charge / charge on one electron
= [tex]\frac{28.17\times 10^{-10}}{1.6\times10^{-19}}[/tex]
= 7 x 10¹⁰
Electric field at 13 cm
= [tex]\frac{9\times10^9\times28.17\times10^{-10}}{26^2\times10^{-4}}[/tex]
E= 375 N/C
