**Field of force**

A region of space where an object feels a force.

**Electric Field:**It is the objects with electric field**Magnetic Field:**It is magnetic materials and moving charges.**Gravitational field:**it is objects with mass.

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**Field Lines**

The lines drawn to represent the strength and direction of field of force.

**Field lines are drawn to represent an electric field.**

**Electric Field strength**

Electric field strength (E) is defined as; at a point is the force per unit charge exerted on a stationary positive charge at that point. i.e. E=F/Q

It follows that the units of electric field strength are newtons per coulomb (NC^-1).

The strength of the electric field between two parallel plates depends on:

Voltage v between the plates

The separation d between the plate

E=V/d

The formula to calculate the force on charge Q in uniform field between two parallel plates is:

F=QE= -QV/d

F=eV/d (for an electron)

An electric charge moves in a parabolic path while moving at a right angle to a uniform electric field.