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A point charge `Q` is situated at point `B` on the ground. A point charge `q` of mass `m` is vertically dropped along line `AB` from a multi storey building of height `h`. Find the position of the point charge `q` when it is in equilibrium
image
A. `sqrt(((qQ)/(4piepsilon_(0)mg)))`
B. `Q/(h^(2))`
C. `(qh)/m`
D. none of these

1 Answer

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Best answer
(a) For equilibrium
`mg=F_(e)` or `mg=(qQ)/(4piepsilon_(0)y^(2))`
`:. Y=sqrt(((qQ)/(4piepsilon_(0)mg)))`
image

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