Magnetic field problem

  • Thread starter jonno426
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  • #1
jonno426
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Homework Statement


In an experiment you find that a small styrofoam ball of mass m can be suspended in mid-air by an electric field of magnitude c pointing straight downward, towards the earth.

Its looking for the charge on the styrofoam ball, and I have no equation to help me solve for it.


Homework Equations


Lol that's what I'm lookin for.


The Attempt at a Solution


:yuck:
 

Answers and Replies

  • #2
Hootenanny
Staff Emeritus
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What is the equation for the force experienced by a charge q in an electric field E?
 
  • #3
jonno426
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k(q1)(q2) / l^2?
 
  • #4
ranger
Gold Member
1,685
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k(q1)(q2) / l^2?

You are given the magnitude of the E field. Note that much emphasis was placed on q and E. The force is proportional to product of two things...
 

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