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umep physics thread

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--- Quote from: kamil9876 on January 13, 2010, 12:11:11 am ---wtf?

--- End quote ---

it's a code
TT posted a hint :P



"A conical surface (an empty ice-cream cone) carries a uniform surface charge . The height of the cone is h, as is the radius of the top. Find the potential at the centre of the top, taking the reference point as infinity."

Can I just see the answers people get for this? Mine differs from the book's and I can't find anything wrong with mine.
 
thanks!

kamil9876:
Draw an line-axis on the surface of the cone (0 is at the tip of the cone). Call this the axis.

Now the surface area of a cone is and we know from similair triangles that . Differentiating gives:

(ie the area of a strip of a cone).


The distance from any point on this strip to the point of interest is .

Now to actually do some electromag:



And now integrate (good luck).

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thx kamil :)

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