# Physics

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?

1. 👍 0
2. 👎 0
3. 👁 136
1. Are the capacitor plates horizontal or vertical or aligned tih the thread? How is the thread prevented from interfering with the capacitor plates?

1. 👍 0
2. 👎 0
posted by drwls
2. dr wls is here now so there is hope.

1. 👍 0
2. 👎 0
posted by Damon
3. They Are Vertical with the ball in between them.

1. 👍 0
2. 👎 0
posted by Trevor
4. 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

1. 👍 0
2. 👎 0
posted by Damon
5. what does sigma represent?

1. 👍 0
2. 👎 0
posted by john

## Similar Questions

1. ### Physics

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

asked by Trevor on February 6, 2008
2. ### Physics

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

asked by Trevor on February 6, 2008
3. ### physics

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

asked by Trevor on February 6, 2008
4. ### physics im stuck

A small plastic ball of mass 6.10 10^-3 kg and charge +0.150 µC? A small plastic ball of mass 6.10 10^-3 kg and charge +0.150 µC is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in

asked by physdummy on August 31, 2008
5. ### Physics

I need immediate help on these questions:. 2.a small plastic ball with a mass of 0.005kg is suspended from a thread and hangs in equilibrium as shown in the drawing below when a small rod with a 2 uC charge is brought to within

asked by Julie on March 30, 2014
6. ### physics

A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the

asked by bob on March 15, 2013
7. ### W

A small plastic ball of mass m = 3.00 g is suspended by a string of length L = 24.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 16.0° angle with the

asked by Kaitie on July 1, 2012
8. ### Physics 2

A small plastic ball of mass m = 3.00 g is suspended by a string of length L = 19.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 17.0° angle with the

asked by James on September 8, 2019
9. ### coll physics II

A small plastic ball of mass 6.10 10^3 kg and charge +0.150 µC is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, with the thread making an angle of 30.0° with respect

asked by physdummy on August 29, 2008
10. ### physics

A small plastic ball with a mass of 7.00 10-3 kg and with a charge of +0.162 µC is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread

asked by teri on September 3, 2009

More Similar Questions