Ok, how should I go about this one?

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To determine the net charge on a 12.00g plastic ball suspended in a uniform electric field of 10^3 N/C at a 30° angle with the vertical, one must analyze the forces acting on the ball. The ball is in equilibrium, indicating that the net force is zero, meaning the electric force and gravitational force are balanced. By identifying the forces and setting up equations for both the x and y components, one can solve for the charge using Coulomb's Law. The equilibrium condition allows for the calculation of the charge based on the known values of the electric field and the weight of the ball. This approach leads to the determination of the net charge on the ball.
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Pendulum

A small 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 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?

Q = _________ C

I know Coloumb's Law, and I assume I want to implement it here somehow, however I don't know where to begin on setting this one up.
 
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Oh, and here is the visual.
 

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The ball is in equilibrium. What does that tell you?
 
That there is no force acting on it?
 
No, that isn't exactly the definition of equilibrium.

Equilibrium is when there is no _net_ force acting on it.
 
matt85 said:
That there is no force acting on it?
That there's no net force acting on it. Or, in other words: The net force is zero.

Start by identifying all the forces acting on the ball, then set up the equations for equilibrium. (Analyze the x and y components separately.)
 

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