Charge over an Insulating Plate

[AJDangles]

Homework Statement

Charge is distributed uniformly over the surface of a very large thin
insulating plate to a density of 5.00 x 10–6 C/m2 . An insulating string
connects a tiny charged bob to the vertical plate as shown in the
diagram. If the mass of the object is .001 g and the string makes an
angle of 30o to the plate, how much charge is carried by the bob?

Homework Equations

I have no clue.

The Attempt at a Solution

No idea where I should start. Can someone point me in the right direction?

 

[SammyS]

Homework Statement

Charge is distributed uniformly over the surface of a very large thin
insulating plate to a density of 5.00 x 10–6 C/m2 . An insulating string
connects a tiny charged bob to the vertical plate as shown in the
diagram. If the mass of the object is .001 g and the string makes an
angle of 30o to the plate, how much charge is carried by the bob?

Homework Equations

I have no clue.

The Attempt at a Solution

No idea where I should start. Can someone point me in the right direction?

First explain where the string is attached to the plate.

Better yet, post an image of the diagram.

 

[AJDangles]

Diagram here:

 

[SammyS]

What is the Electric field near the surface of the plate?

 

[AJDangles]

What is the Electric field near the surface of the plate?

Take the force of gravity times a component of the angle, multiply by the charge of a proton?