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Homework Help: Force on an electron from a magnetic field

  1. Jun 23, 2008 #1
    1. The problem statement, all variables and given/known data
    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.

    2. Relevant equations

    3. The attempt at a solution
    180+tan^-1(-200/2000)=174.3 degrees but webassign said it was wrong.
    Last edited: Jun 23, 2008
  2. jcsd
  3. Jun 23, 2008 #2
    sorry the title should have said force on an electron from an elecrtic field
  4. Jun 23, 2008 #3
    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.
  5. Jun 23, 2008 #4
    I am looking for the angle made by F and the positive x axis
  6. Jun 23, 2008 #5
    F is in the opposite direction of E right?
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