What is the Electric Field Between Deflection Plates in a TV Tube?

[raikchuuyl]

Homework Statement

An electron beam in the TV tube is steered across the screen by the field between two charged plates. If the electron experiences a force of 3.ox10(to the negative 6th)N, how large is the field between the deflection plates?



2. Homework Statement
The custodian dusts off a globe with a duster, causing the globe to acquire a charge of -8.0x10(to the negative 9th)C. What is the magnitude and direction of the electric field at a point 0.40m from the center of the charged globe?

 

[americanforest]

For number one: What is the force on a point particle with charge q in a uniform field E?

For number two: Assuming the charge distributes uniformly over the sphere, what simplification can you make? Think Gauss's law.