An electric field is a region in which an electric charge experiences a force. It is a fundamental concept in physics that helps us understand the behavior of charged particles.
A point charge is a theoretical concept in which all the charge is concentrated at a single point. It is used to simplify calculations in physics and is often represented by the symbol "q".
The electric field of a point charge can be calculated using the formula E = kq/r^2, where E is the electric field, k is the Coulomb's constant (8.99 x 10^9 Nm^2/C^2), q is the charge of the point charge, and r is the distance from the charge.
The direction of the electric field of a point charge is always away from a positive charge and towards a negative charge. This direction can be represented by arrows pointing away or towards the charge, depending on its sign.
The electric field strength decreases with distance from a point charge. This is because the electric field is inversely proportional to the square of the distance from the charge. As the distance increases, the electric field becomes weaker.