(adsbygoogle = window.adsbygoogle || []).push({}); 1. A circular metal plate of radius 10cm is given a charge of 20 microCoulomb. Determine the outward pull on the plate, k=1

i can solve the problem by using the equation F= [sigma ^2]A/2 epsilon* K and finding [tex]\sigma[/tex] = Q/A{where A= area of surface(plate), Q = charge}

My problem:

to find area of plate i used the equationpi*r^2; or do i need to consider 2[tex]\pi[/tex]r^2 as plate have two surfaces.

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# Homework Help: Problem regarding area

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