An electric field of intensity ` 9 xx 10^(4)N//C` is produced at a point 2 cm away from an infinitely long straight charged conducting wire . Electric charge per unit length becomes

Options

A. `2xx10^(-7) C*m^(-1)`
B. `10^(-7)C*m^(-1)`
C. `9xx10^(4)C*m^(-1)`
D. none of these

Explanation

Intensity at a point at a distance r from an infinitely long straight wire ,
`E=(lambda)/(2pi epsi_0 r)` ltbvrgt `:. lambda = 2pi in_0 r E=( 2 xx 10^(-2) xx 9 xx 10^(4))/(2 xx 9 xx 10^(9))=10^(-7)C*m^(-1)`