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Problem abput electricity

by shotikokobaxi
Tags: abput, electricity
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shotikokobaxi
#1
Dec7-12, 09:45 AM
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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gneill
#2
Dec7-12, 09:53 AM
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P: 11,675
Quote Quote by shotikokobaxi View Post
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?
shotikokobaxi
#3
Dec7-12, 11:36 AM
P: 2
Quote Quote by gneill View Post
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

gneill
#4
Dec7-12, 01:31 PM
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P: 11,675
Problem abput electricity

Quote Quote by shotikokobaxi View Post
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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