Electric field on the axis of a small el...

Electric field on the axis of a small eletric dipole at a distance r is `E_1` and at a distance of `2r` on its perpendicular bisector, the electric field is `E_2` . Then the ratio `E_2:E_1` is

`1:4`

`1:16`

`1:8`

`1:2`

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