# Problem abput electricity

by shotikokobaxi
Tags: abput, electricity
 P: 2 1. The problem statement, all variables and given/known data We have a charge Q and it's h metres far from the flat surface. Find the force with which acts on the Q charge by the surface The answer is: F=kQ2/4h2 i couldn't get it, please help me. 2. Relevant equations 3. The attempt at a solution
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P: 11,675
 Quote by shotikokobaxi 1. The problem statement, all variables and given/known data we have a charge Q and it's h metres far from the flat surface. Find the force with which acts on the Q charge by the surface The answer is: F=kQ2/4h2 i couldn't get it, please help me
Wow! No need to shout (Big loud font)

Welcome to Physics Forums, shotikokobaxi.

What formula(s) are appropriate here? Is the flat surface a conducting surface? If so, what analysis technique is appropriate for calculating the effects of an induced charge?
P: 2
 Quote by gneill Wow! No need to shout (Big loud font) Welcome to Physics Forums, shotikokobaxi. What formula(s) are appropriate here? Is the flat surface a conducting surface? If so, what analysis technique is appropriate for calculating the effects of an induced charge?
we use kulon's force F=kq2/r2 the question is to find the force with which the surface (which hasn't any charges) acts on the Q charge

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P: 11,675
Problem abput electricity

 Quote by shotikokobaxi we use kulon's force F=kq2/r2 the question is to find the force with which the surface (which hasn't any charges) acts on the Q charge
Yes, that's what we call Coulomb's force law for electric charges. It is applicable, but there's a special technique which can be used for cases where one charge induces a charge in an otherwise uncharged conducting surface as you have here. Look up "the method of image charges".

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