Solve the all parts of following problem:
Problem: 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?
g
Part B: What is the strength of the electric field?
N/C
Please help for the above question, completely confused!! Show each steps if possible, Thanks.