A positive point charge `50 mu C` is located in the plane `xy` at the point with radius vector `r_(0) = 2i + 3j`, where `I` and j are the unit vectors of the `x` and `y` axes. Find the vector of the electric field strength `E` and its magnitude ath the point with radius vector `r = 8i - 5j`. Here `r_(0)` and `r` are expressed in metres.

Explanation

Sought field strength
`vec(E) = (1)/(4pi epsilon_(0)) (q)/(|vec(r ) - vec(r_(0))|^(2))`
`= 4.5 kV//m` on putting the values.