# Physics

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A small plastic ball with a mass of 6.50x10^-3 kg and with a charge of +0.150x10^-6 C is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, whit the tread making an angle of 30 degrees with respect to the vertical. The area of each plate is 0.0150 m^2. What is the magnitude of the charge of each plate?

• Physics -

Are the capacitor plates horizontal or vertical or aligned tih the thread? How is the thread prevented from interfering with the capacitor plates?

• Physics -

They Are Vertical with the ball in between them.

• Physics -

dr wls is here now so there is hope.

• Physics -

Force down = m g = 6.5*10^-3 *9.8 = 53.7*10^-3 N
Force sideways = q E
where E = sigma/eo
so force sideways = q sigma/eo
then
tan 30 = (q sigma /eo)/53.7*10^-3
you know q, eo
so solve for sigma
charge = sigma * plate area

• Physics -

what does sigma represent?

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