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Old Aug 30th 2009, 07:17 PM   #1
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parallel plates

I dont know where to begin with these one could somebody help me with it

Two large, parallel metal plates carry opposite charges of equal magnitude. theyh are separated by 45mm and the potential difference between them is 360 volts.
a) what is the magnitude of the electric field (assumed to be uniform) in the region between the plates?
b) what is the magnitude of the force this field exerts on a particle with charge +2.40 nC?
c) use the results of part b) to compute the work done by the field on the particle as it moves from the higher potential plate to the lower?

hoping for a reply thanks...
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Old Aug 30th 2009, 08:54 PM   #2
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OK, you don't know how to start.
Let me remind you of some equations for parallel plates.
$\displaystyle V=Ed$
V is the potential difference across the parallel plates
E is the electric field strength
d is the separation between the plates

$\displaystyle F=Eq$
F is the force experienced by a unit test charge
E is the electric field strength
q should be the charge

These problems are typical questions, you should find more examples in text books. In case you haven't learnt about the topic, this question may be a bit difficult with equations not known.
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Old Aug 30th 2009, 09:43 PM   #3
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oh ok thanks but what about the plates their do they have any effect about the problem?
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Old Aug 31st 2009, 10:07 PM   #4
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I don't quite understand what you mean
what about the plates their do they have any effect about the problem?
For parallel plates, the electric field lines inside are parallel to each other which is very different from the field lines of a charged sphere which may be diverging. If the electric field is not constant, you cannot use the equations mentioned
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Old Aug 31st 2009, 10:23 PM   #5
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Thumbs up thanks

you do answered my question though
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