Electric Field Intensity due to a point charge, electric field lines

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Electric Field:

The region around a charge particle is called field.

Source charge: The point charge producing electric field is known as source charge.

Test charge: The charge experiencing a force in the field of source charge.

Electric Field Intensity:

The electric field intensity at any point due to a source charge is defined as the force experienced by a unit positive test charge.

Properties:

It is a vector quantity.
Its direction is same as the force experienced by positive charge.
It obeys superposition principle.

Electric Field Lines:

Electric field lines are straight or curved imaginary lines. If a tangent is drawn at any point on it, gives the direction of electric field intensity at that point.

Properties:

The electric field lines starts from a positive charge & ends on a negative charge.
The tangent to the electric field line gives the direction of field intensity.
No two electric field lines can intersect each other.
These lines are always perpendicular to surface.
They are closely packed in strong electric field region and farther apart in weak electric field region.
They don't form closed loops.
Electric field lines do not pass through a conductor.
Electric field lines pass through dielectric.