Solve the all parts of following question:
Question: A plastic ball has a charge of 2.65 µC and is attached to a string. When the ball is placed in a uniform horizontal electric field, the string makes an angle of 13.0° with the vertical and has a tension of 0.415 N.
Part A: What is the mass of the small plastic ball?
Part B: What is the strength of the electric field?
I have been stuck on this problem for a long time, please help. Show steps. Thanks!