An infinite line charge produces a field of `9 xx 10^4` N/c at a distance of 2 cm. Calculate the linear charge density.

An infinite charged wire produces a dield of 18xx10^(4) N/C at a distance of 1 m. Calculate the linear charge density of the wire.

Potential at a point due to a positive charge of 10 muC at a distance of 9 m is

Find electric field intensity due to an electric dipole of moment 16.9 xx 10^(-7)C-m at a distance of 12cm from its centre on its equator, if the length of the dipole is 10cm.