The electric field at point P due to a point charge Q at a distance R away has magnitude E. In order to double the magnitude of the field at P, you could double the charge Q or keeping the same charge you can introduce a medium of permittivity
as detailed below.
<em>An </em><em>electric field</em><em> is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. </em>Electric field is defined as the electric force per unit charge i.e.
Electric field due to a point charge q at a point P which is at distance d is defined as,
;
where
is the permittivity of medium.
- <em>If the distance (</em>
<em>) is constant, for a given medium </em>
<em>, the </em><em>electric field </em><em>is directly proportional to charge </em>
<em> i.e </em>
.
If the electric field strength
is twice
then, 

or 
Doubling the charge of the particle will double the electric field at point P which is at distance R.
- If the distance (
)is constant, for a given charge
, the electric field is inversely proportional to the permittivity of the medium i.e
.
If the electric field strength
is twice
then,


We can introduce a medium of permittivity
.
For more details on electric field, check:
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