Physics

posted by .

A 2.0 mm diameter glass sphere has a charge of +1.0 nC. What speed does an electron need to
orbit the sphere 1.0 mm above the surface? (Ans. 2.81×107 m/s)

• Physics -

So the electron is 2mm from the center.

set coulombs force= centripetal force
kQ1*e/r^2=m v^2/r
solve for v

Similar Questions

1. Physics

Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B and there is a 90 degree …
2. Physics repost

Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B and there is a 90 degree …
3. Physics

Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B. Calculate the initial …
4. physics

A uniformly charged conducting sphere of 1.2 m diameter has a surface charge density of 7.1 µC/m2. (a) Find the net charge in coulombs on the sphere. (b) What is the total electric flux leaving the surface of the sphere?
5. Physics

A 3.2 cm diameter plastic sphere is charged to -19.0 nC. What orbital frequency must a proton have to maintain a circular orbit around the sphere 2.4 mm above its surface?
6. Physics

A proton is launched from the surface of a 2.0 cm diameter glass sphere that is charged to -25.0 nC. What is the speed of the proton when it is launched so that it just escapes the influence of the charge of the glass sphere?
7. physics

1.) A small sphere of charge 2.4 μC experience a force of 0.36 N when a second sphere of unknown charge is placed 5.5 cm from it. What is the charge of the second sphere?
8. College Physics

A uniformly charged conducting sphere of 1.3 m diameter has a surface charge density of 8.7 µC/m2. (a) Find the net charge in coulombs on the sphere. (b) What is the total electric flux leaving the surface of the sphere?
9. physics

a solid copper sphere 10 mm in diameter has a positive charge arising from the removal of one electron from each 10^12 copper atoms. determine the net charge on the sphere, the electric field strength and electric potential at the …
10. Physics

What is the escape speed of an electron launched from the surface of a 1.5 cm diameter glass sphere that has been charged to 10 nC?

More Similar Questions