A charge `q=10muC` is distributed uniformly over the circumference of a ring of radius 3m placed on x-y placed with its centre art origin. Find the electric potential at a point `P(0,0,4m)`

Options

A. `2xx10^4V`
B. `1.8xx10^4V`
C. `4xx10^4V`
D. `5xx10^4V`

Answer

B

Explanation

The electric potential at point P would be

`V=1/(4piepsilon_0).q/r_0`
Here, `r_0=` distance of point P from the circumference of ring
`=sqrt((3)^2+(4)^2)=5m`
`and `q=10muC=10^-5C`
Substituting the values we have
`V=((9.0xx10^9)(10^-5))/((5.0))=1.8xx10^4V`