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Potential energy problem , i need help !

by kuwaiteng
Tags: energy, potential
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kuwaiteng
#1
Oct22-06, 09:01 AM
P: 2
hello !
i have an assignment on Electric Potential Energy , can any one help me on solving it ?
the problem says : A small sphere with mass 2.70 g hangs by a thread between two large parallel vertical plates 5.00 cm apart.
The plates are insulating and have uniform surface charge densities . The charge on the sphere is q = 8.8010^−6 C .
What potential difference between the plates will cause the thread to assume an angle of 30.0 with the vertical ?
see the figure :P
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yf_Figure_23_32.jpg  
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semc
#2
Oct22-06, 09:51 AM
P: 331
draw the FBD of the sphere and resolve the forces in the x and y direction
kuwaiteng
#3
Oct22-06, 12:04 PM
P: 2
thanx ,, i think i got the answer by drawing the diagram :
E = Mgtan(30)
F=E\q
V= E.d
it is right ?


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