A small electric dipole is placed at origin with its dipole moment directed along positive x-axis. The direction of electric field at point `(2,2 sqrt(2),0)` is

Options

A. Along Z-axis
B. Along Y-axis
C. Along negative Y-axis
D. Along negative Z-axis

Answer

B

Explanation

`E cos a =(2p cos theta)/(4 pi e_0 r^3) and tan theta =(2sqrt2)/2`
E sin a `=(p sin theta)/(4 pi e_0 r^3)`
`implies tan a= (tan theta)/2=1/sqrt2= cot theta`
`implies a=90^@- theta implies overline E` is parallel to y axis