Solving a problem in physics section 73 point 27 electr

Solving a problem in physics section 73 point 27 electr

27. An equally charged ball with a mass of 0.5 g and a charge of 0.10 nC is suspended from an infinite uniformly charged vertical plane with a surface charge density of 30 μC / m2. At equilibrium, what is the tension force of the thread in mN and what is the angle between the plane and the thread?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)