In the figure a small nonconducting ball of mass

In the figure a small, nonconducting ball of mass m = 1.0 mg and charge q = 2.0 × 10^-8 C (distributed uniformly through its volume) hangs from an insulating thread that makes an angle θ = 30° with a vertical, uniformly charged nonconducting sheet (shown in cross section). Considering the gravitational force on the ball and assuming the sheet extends far vertically and into and out of the page, calculate the surface charge density σ of the sheet.

[kavijk]

dude. u already have ur own spot in heaven.

[Broughtvulture]

This greatly helped me practice for my Physics 2 homework, also I like how you went over Physics 1 concepts. Really helps solidify and remove any assumptions that could've been made. Thank you

[haroldp.sadwood]

Daaamn, I did all the N2L stuff right and got the electric field value, but I forgot about the equation for an infinite insulating sheet of charge! Thank you for this!

[shabnamsheikh]

A group of students are to experimentally determine the mass m of a nonconducting ball of known charge q using the experimental setup shown in the diagram. A variable power supply is connected to two large parallel conducting plates. The charged ball hangs between the plates on an insulated string and comes to equilibrium while hanging at an angle @ to the vertical, as shown. The students are expected to determine the mass of the ball by plotting their data in a graph. The students have access to equipment commonly found in a high school physics laboratory, but the experiment must use the setup shown above

(a) Clearly identify each quantity to be measured, the symbol used to represent that quantity, and the equipment that would be used to measure the quantity

[bigl]

Maybe i ask why is the ball in equilibrium?