An infinitely long thin straight wire has uniform linear charge density of `1/3Cm^(-1)` .Then, the magnitude of the electric intensity at'a point 18 cm away is
(given `epsilon_(0) = 8.8 xx 10^(-12) C^(2) Nm^(-2))`

Options

A. `0.33 xx 10^(11) NC^(-1)`
B. `3 xx 10^(11) NC^(-1)`
C. `0.66 xx 10^(11) NC^(-1)`
D. `1.32 xx 10^(11) NC^(-1)`

Answer

(a)

Explanation

Magnitude of electric intensity at point is given by ,
`E = lambda/2 pi epsilon_(0)r = (2 xx 9 xx 10^(9) xx 1/3)/18 xx 10^()-12`
`= 0.33 xx 10^(11) NC_(-1)`