The electric field can be thought of as an electric property associated with any point in space where a charge exists in any form. The electric force per unit charge is another way to characterize an electric field.
The equation for the electric field can be written as: , Where = Electric field, = Electric force, and = Charge
Therefore,
If an electric field has the same magnitude and direction everywhere in a particular space, it is said to be uniform.
If the force exerted on the charge is the same regardless of where it is placed in the electric field, we can conclude that the given electric field is uniform.
Hence, this is the way to know if an electric field is uniform.