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## Homework Statement

[1] Sphere A has a radius of 10.0 cm and carries a charge of +5.0 x 10^(-8) C

while sphere B has a radius of 5.0 cm and carries a charge of -2.0 x 10^(-8) C.

The spheres are conducting hollow, and concetric.

A) calculate the magnitude and direction of the electric field (E) at a point

3.00 cm from the center of the arrangement.

B) Calculate E at 6.00 cm from the center.

C) Calculate E at point 12.0 cm from the center.

D) Calculate the potential difference between the outer surface of the inner

sphere and the inner surface of the outer sphere.

E)A very small particle [ m = 2 x 10^(-9) kg, q = 1.5 x 10^(-9) is released from

the outer surface of the inner sphere. Calculate the speed with which it will

strike the inner surface of the outer sphere.

## Homework Equations

E = q / eo = òE·dA [not sure im using the right formula]

## The Attempt at a Solution

I got an answer for a = 280

B) 70

C) 17.5

D) 15.7

E) no idea

But all of them are wrong. This problem is really irritating me, someone please help me out.

## Homework Statement

[2] Two sheets od metal (A = 5.0 cm^2 are parallel and separated by 2.0 mm.

The potential difference between them is 1500V.

A) Calculate the electric field that exist between the plates.

B) Calculate the charge on the postive plate on the postive assuming the plates

have equal but opposite charges.

C) Calculate the work done in separating the plate to 3.0 mm apart.

## Homework Equations

## The Attempt at a Solution

No bloody idea about this problem.