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Old Nov 1st 2008, 01:55 PM   #1
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Join Date: Nov 2008
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3 Questions! Need help FAST! Electric Charges and Fields!

Couple questions, whatever you can answer will be appreciated.

9. Three small, negatively charged spheres are located at the vertical of an equilateral triangle. If the magnitudes of the charges are equal, sketch the electric field in the region around this charge distribution, including the space inside the triangle.

A charge of 1.2x10^-3C is fixed at each corner of a rectangle that is 30cm wide and 40cm long. What is the magnitude and direction of the electric force on each charge? What is the electric field and the electric potential at the centre?

An electron with a velocity of 5x10^6m/s is injected into a parallel plate apparatus through a hole in the positive plate. It moves across the vacuum between the plates, colliding with a negative plate at 1x10^6m/s. What is the potential difference between the plates?(mass of electron = 9.1x10^-31kg)
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