Force on an electron from a magnetic field

[brett812718]

Homework Statement

A 17.0 g block with a charge of +1.30 10-4 C is placed in an electric field e vector = (2000 i hat - 200 j hat) N/C.
(a) What is the electrostatic force on the block?
the force is 2.61E-1N but I am having trouble finding the angle.

Homework Equations

F=qE

The Attempt at a Solution

180+tan^-1(-200/2000)=174.3 degrees but webassign said it was wrong.

 

[brett812718]

sorry the title should have said force on an electron from an elecrtic field

 

[Zizy]

You might try writing only tan^-1 part (so you get like 6 degrees) and test this solution. Or use 90 instead of 180 deg... some diagram which angle are you looking for would be helpful.

 

[brett812718]

I am looking for the angle made by F and the positive x axis

 

[brett812718]

F is in the opposite direction of E right?