Question

A positive point charge (+q) is kept near a charged plate.
(i) Draw the electric field lines of forces from point charge to
the plate.
(ii )Derive an expression for the electric field intensity at the
surface of the plate.​

Answer 1

Answer:

Representation of electric field : The electric field due to a positive charge (+q) is represented as in fig. <br> Electric field due to a point charge : Consider a point charge +q placed at the origin O of the coordinate frame. Let

be any test charge placed at P. <br> According to Coulomb's Law, force on the test charge

due to charge q is given by <br>

<br> where

is a unit vector along OP. If

be the electric field at point P then <br>

<br>

<br>

The magnitude of the electric field at point P is given by <br>

<br> The electric field due to a point charge is spherical symmetric about the charge. <br>