An infinitly long thin straight wire has uniform linear charge density of `1/3` c/m . Then, the magnitude of the electric intiensity at a point 18 cm away is .......... `NC^(–1)` .
Options:
(a) `0.66xx 10^(11)`
(b) `1.32 xx10^(11)`
(c) `0.33 xx10^(11)`
(d) `3xx10^(11)`