## problem abput electricity

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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 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?

 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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## 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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