The electric field at a distance `r` from a long wire having charge per unit length `lambda` is

Options

A. `k((lambda)/(r^(2)))`
B. `k((lambda)/(r))`
C. `k((lambda)/(2r))`
D. `k((2lambda)/(r))`

Answer

4

Explanation

`E = (lambda)/(2 pi in_(0) r) = (1)/( 4 pi in_(0)) .(2 lambda)/(r ) = k ((2 lambda)/(r ))`