Question

A small electric dipole is placed in x-y plane at origin with its dipole moment directed along positive with x-axis.
The direction of electric field at point (2,2√2,0)
(1) along positive z-axis
(2) along positive y-axis
(3) along negative y-axis
(4) along negative z-axis

Answer 1

Given:

Point of electric field is (2,2√2,0)

To find:

The direction of the electric field at a point

Solution:

The angle relation is

tanФ=tan∅/2

=√2/2

=1/√2

=1/tanФ

= cotФ

or cot(90-Ф)

α+Ф=90°

Therefore the direction is along the positive y-axis.

So the option b is correct