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Grade: 12th pass
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
2 months ago

Answers : (2)

58 Points
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
2 months ago
Vikas TU
11680 Points
Dear student 
Hope your doubt gets cleared 
Please refer the solved examples of the below link 
2 months ago
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