Question

A small spherical insulator of mass 5.16 10-2 kg and charge +0.600 µC is hung by a thin wire of negligible mass. A charge of −0.900 µC is held 0.150 m away from the sphere and directly to the right of it, so the wire makes an angle θ with the vertical.

a) Find the angle θ

b) Find the tension in the wire