ı need help asap thank you of the tnd Cchaige. I t 2. A thin-walled metal…

ı need help asap thank you
of the tnd Cchaige. I t 2. A thin-walled metal sphere has a radius of 20 cm and carries a charge of 6.0×10-7 C. A point charge of -3.0×107 C is placed in the centre of the sphere. Find E for a point (a) inside the sphere, (b) just outside the sphere.