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...
Okay, hypothetically speaking, I have a styrofoam ball that can be suspended by a positive magnetic force pointing straight down at the earth, and I'm only given the mass of the styrofoam ball, is there an equation that can help me solve for Q?