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Potential at two points are given due to charge present at origin. We have to calculate potential at third point given due to the same charge

Potential at two points are given due to charge present at origin.
We have to calculate potential at third point given due to the same charge

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Grade:12th pass

2 Answers

Parth
58 Points
3 years ago
See the potential diifference at any distance r from q charge, is given by  k*q/r.
I above case the the potential at origin will not be zero so
Potential at any distance r will be  = V’ + k*q/r, where V’ = potentail at origin .
let k*q = p
now you have three equation and three variables
V’ + p/2 = 15
V’ + p/(1/2) = 30 
V + p/1 = your ans 
on solving you will get V’ = 10 and p = 10
so you ans will be 20 volts – option C
Vikas TU
14149 Points
3 years ago
Dear student 
Hope your doubt gets cleared 
Please refer the solved examples of the below link 

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