r' is the position vector from selected origen to a charge element.Cocoleia said:
An electric field is a physical quantity that describes the influence that an electric charge has on other charges in its surroundings. It is a vector quantity, meaning it has both magnitude and direction.
A charged square loop is a square-shaped circuit or wire that has an electric charge. This charge can be either positive or negative and can be created by applying a voltage to the loop or by having a charged object near the loop.
The electric field above a charged square loop can be calculated using the formula E = kQ/d^2, where E is the electric field, k is the Coulomb's constant, Q is the charge of the loop, and d is the distance from the loop to the point where the electric field is being measured.
The electric field above a charged square loop is affected by the charge of the loop, the size and shape of the loop, and the distance from the loop to the point where the electric field is being measured. It is also affected by any other nearby charges or electric fields.
The direction of the electric field above a charged square loop is determined by the direction of the electric force on a positive test charge placed at that point. It is always perpendicular to the surface of the loop and points away from the loop for a positive charge and towards the loop for a negative charge.