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umep physics thread

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/0:
Is it possible to charge up a capacitor in a circuit without a resistor? What would happen to the time constant?

/0:
Ah well, umep may be over but I still have questions :D

Say you have a charge distribution in the picture, and you want to find the potential THEN the electric field at P, using

I found the potential to be 0, and yet the field isn't. Why is this?


Thnx :)

kamil9876:
How did you work out ?

/0:
I just used



(reference point at infinity)

kamil9876:
The problem is you worked out V at a single point, rather than as a function in terms of and . (e.g: say for simplicity z=0 so we have a one dimensional case, then you have
But V=0 at x=a, does not imply the derivative at x=a is 0

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