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v_pino said:But this is only the case when we assume that it is +1C at O. If we assume that it is negative that the resultant field strength is downwards. How come we can be sure to make the assumtion that it is +1C?
Electric field strength is a measure of the intensity of an electric field at a specific point in space. It is a vector quantity, meaning it has both magnitude and direction, and is typically measured in volts per meter (V/m).
Electric field strength is calculated by dividing the force exerted on a test charge by the magnitude of the charge. This can be represented by the equation E = F/q, where E is the electric field strength, F is the force, and q is the charge.
The electric field strength at a point is influenced by several factors, including the magnitude and distribution of the electric charges creating the field, the distance from the charges, and the medium in which the charges are located.
Electric field strength and electric potential are related but distinct concepts. Electric field strength measures the force exerted on a charge by an electric field, while electric potential measures the potential energy per unit charge at a given point.
Electric field strength plays a crucial role in understanding and predicting the behavior of electric charges and their interactions. It is also essential in many real-world applications, such as in the design of electronic circuits and in the study of lightning and other atmospheric phenomena.