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Shivam Bhagat Grade: 9
        If 3 different but eqeul charges are forming an equilateral triangle, then where inside the triangle the potential would be 0 and why????? Pls explain!!!!!!!
6 years ago

Answers : (2)

iit jee
44 Points
										

hi,


potential due to three chrges at a point is= -kq/r1-kq/r2-kq/r3.


thus potential=-kq(1/r1+1/r2+1/r3)


if potential has to be zero then that point should be at infinity ( r1r2r3 should be at infinity)


plzz approve if you like the answer

6 years ago
vikas askiitian expert
510 Points
										

dear shiven , first u draw the figure according to these steps


1)draw a equilateral triangle ABC such that its base AB is on x axis , center of base is at origin...
third vertice (C) is on y axis ...


2)y axis divides the base in two halves , AO ,BO ...


3) consider any point P(0,y) on y axis then


4) place -q , -q at A,B & q at C...


now , potential at P will be


V = k(-q)/AP + K-(q)/BP + kq/PC .......1


AO = BO = a/2


PC = asin60 - y = [aroot3/2 - y] ........2


AP = BP = [y^2 + a^2/4]^1/2 ......3 ( by pythagorus theorem)


for potential to become 0 , eq 1 = 0 so


q/AP + q/BP = q/PC


2/AP = 1/PC


AP = 2pC .........4


putting values of AP,PC from eq 2 & 3 we get a quadratic expression


3y^2 - (4root3a)y + 11a^2/4 = 0


 


from here Y = a[4root3 +(-) root15]/6



= a[ 4root3 - root15]/6 or [4root3 + root15]/6 ( not acceptable coz this point lies ouside)


 


therefore the only point is Y = a[4root3-root15]/6


 


this is the required point where potential will be zero ...

6 years ago
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