Question

the electric field due to a small dipole at a distance r from the centre of dipole on axis is E. Find the distance on the equitorial line to have same electric field E​

Answer 1

Answer:

When a dipole AB of very small length is taken, then for a point P located at an axial distance r from the axis the electric field is given by

E=

4πε

0

1

r

3

2P

...(i)

When dipole is rotated by 90

o

, then electric field is given by

E

′

=

4πε

0

1

r

3

P

...(ii)

From Eqs. (i) and (ii), we get

E

′

=

2

E

solution

Explanation:

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