How much work will be done in bringing a charge of `400muC` from infinity to some point P in the region of electric field ? Take, the electrc potential at point P is 20 V.

Explanation

As electric potential at any point can be written as electric potential `(V)=("work done (W)")/("charge "(q_(0)))`
Given, `V_(p)=20V`
and `q_(0)=400muC=400xx10^(-6)C`
On putting the values, we get
`20=(W)/(400xx10^(-6))`
`:." "W=20xx400xx10^(-6)`
`=8xx10^(-3)J`