Pls help with qn 1 and 2

Problem 1: Two metallic spherical thin shells of radil R1=20 cm and Ra=10 cm are separated by 2m and carry, respectively, charges q1=+100mC and q2=+50mC. A very small sphere of negligible mass and charge FWUI . q3=+1mC is suspended by a thin Insulating rod of negligible mass pivoting exactly halfway between the charged spheres and elevated by 10m. The rod can be assumed to be 10m in length so that the angle it forms with the vertical is considered small. (Figure not to scale) a) Calculate the initial angle O if the system is in equilibrium. 308-0 b) Suppose that now the two shells are brought into contact and then returned to their initial position. Calculate the new angle 0. 10m 2m Problem 2: Consider a uniformly charged, thin ring with radius 15.0 cm and total charge of +24.0 nC. An electron is placed on the ring's axis at a distance 30.0 cm from the center of the ring and is constrained to stay on the axis of the ring. a) What is the electric potential at the electron's initial position. b) What is the electric potential at the center of the ring. c) The electron is then released from rest. Describe its subsequent motion. d) Find the speed of the electron when it reaches the center of the ring