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Old Jan 17th 2009, 10:41 AM   #1
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Exclamation electric fields

A tiny Styrofoam ball of mass 0.5 g is suspended by a light thread of negligible mass. The ball is electrically charged with charge, q. A uniform, horizontal electric field of 400 N/C is then turned on and the ball is deflected through an angle of 150. What is charge, q?
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Old Jan 18th 2009, 06:37 PM   #2
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Originally Posted by physics123456 View Post
A tiny Styrofoam ball of mass 0.5 g is suspended by a light thread of negligible mass. The ball is electrically charged with charge, q. A uniform, horizontal electric field of 400 N/C is then turned on and the ball is deflected through an angle of 150. What is charge, q?
I find a very good website for this kind of problem. You should click the help button and you will be guided step by step.
ie 01/p5new

You may first draw the free body diagram, drawing all forces(weight, force on charge and the tension).Given the electric field, you can let the force be 400q. As it is in equilibrium, the forces in x-y-planes are the same. You can find the unknown you want.
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