# Electric Flux homework

1. Apr 10, 2011

### smahapatra3

1. The problem statement, all variables and given/known data
The electric field is measured all over the surface of a cylinder whose diameter is 8 cm and whose height is 20 cm, as shown in the diagram. At every location on the surface the electric field points in the same direction (+y). E1 is found to be 533V/m; E2 is 730V/m; E3 is 1226V/m.

http://www.webassign.net/mi3/22.P.015.alt01-CylinderE_2.gif

Which of the following statements are true?
1. This is an impossible pattern of electric field.
2. Only the curved surface of the cylinder gives a nonzero contribution to the net electric flux.
3. The flux on the flat ends of the cylinder is 0.
4. Not enough information is given to solve this problem.
5. The angle between E1 and is 90 degrees.
6. The angle between E2 and is 90 degrees.
7. The net flux on this cylindrical surface is negative.

2. Relevant equations

Gauss's Law

3. The attempt at a solution

1 is wrong because something other than the cylinder is causing the electric field. I 2 is wrong because no part of the cylinder contributes to the electric field. So that makes 3 right. I'm not sure about 5 or 6. I know 7 is right.