A small 12.00 g plastic ball is suspended by a string in a uniform, horizontal electric field. If the ball is in equilibrium when the string makes a 30 angle with the vertical, what is the net charge on the ball

Here is the complete question:

A small 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 103 N/C. If the ball is in equilibrium when the string makes a 30 angle with the vertical, what is the net charge on the ball?

The charge on the ball is 5.71 × 10^-4 C

Explanation:

Please see the attachments below

what type of charge does it have? negative