Electric field intensity at a point varies as `r^(-3)` for

Find an expression for electric field intensity due to a point charges.

State whether the following statements are True (T) or False (F): The magnitude of electric field intensity at a point near a infinite plane sheet of uniform charge density varies inversely as the distance of the point of obervation form the source charge.

What is an ideal electric dipole ? Find the electric field intensity at a point in the end - on position of a dipole.

The electric field intensity |vecE| at any point inside a charged sphere of radius r is

How is electric field intensity at a point related to the potential gradient there ?

How is electric field intensity at a point related to the potential gradient there ?

Electric field intensity at an outside point of a charged thin spherical shell is