One possible solution is to apply the concept of point masses to distant bodies. Similarly, if a charge distribution is far enough away, it can be approximated as a point charge with a total charge of Q. This allows for the calculation of the center of charge. This approach is known as the multipole expansion, […]

# Category: Electrostatics

## What is electric dipole?

An electric dipole is an object (or, in general, a charge distribution), where the two charges are not evenly distributed . Imagine a convenient object for starts, like a rod. The positive and negative charges could be completely separated spatially, or they could be mixed but unevenly. Question: I am confused about the concept of […]

## Understanding the Definition of Coulomb: A Unit of Measurement

A Coulomb is a specific amount of charge . In this model, it is similar to a specific number of chain links. Neither is directly related to speed that a signal will move through a wire or a chain. Solution 1: Coulomb was unaware of the exact magnitude of the charge, but he managed to […]

## Scalar or Vector: The Nature of Electric Potential

It is easier to work with sums of scalar fields than vector fields, which makes the potential useful. Suppose we have a system of three particles with electric charges $+Q_A$, $-Q_B$, and $+Q_C$, located at positions $A$, $B$, and $C$, respectively, with position vectors $bf{r}_A$, $bf{r}_B$, and $bf{r}_C$ relative to an arbitrary origin O. The […]

## Electric Field Direction: Unraveling the Mystery

It turns out that the electric field only goes outward in the direction perpendicular to the curved surface , so in the s ^ -direction / perpendicular to the axis of the cylinder. Solution: Assuming that the cylinder is lengthy, you measure the field at a point that is either in the center where the […]

## The effect of an electric field on the work done on a point charge

The force F on charge q caused by charge Q is determined only by the distance r between them, resulting in the magnitude of the electric field E being solely determined by this distance as well. Consequently, the electric field E of charge Q remains constant at equal distances. The calculation of the force F […]

## Query Regarding Conversion of Electron Volts to Volts

One possible solution is to clarify the distinction between an electron volt and a volt. Specifically, an electron volt represents the amount of energy gained or lost by an electron when it is moved across a potential difference of one volt. This is different from the definition of the volt in electrical engineering, which is […]

## Exploring the Reasoning behind Considering the Electric Field of an Infinite Plane

The electric field is constant at any point due to a plane sheet of charge, regardless of the radius. This can be proved by Gauss’ theorem. However, one may wonder why an infinite length is necessary when the same theorem can be applied to a finite length of a plane sheet of charge, producing the […]

## Duplicate Question: Spherical Capacitor’s Capacitance

Consider two concentric shells with charges Q1 on the outer sphere and Q on the inner sphere. The capacitance of the spherical capacitor can be calculated using the formula C = 4πε0b when the inner surface of the outer sphere is grounded. However, the charge Q on the outer surface of the inner sphere generates […]

## Arrangement of Capacitors in Series and Parallel for Charge Distribution: A Rephrased Perspective

In reference to Fig 3, plate A becomes positively charged as the battery’s positive terminal draws electrons from it. Subsequently, plate C, which is also positively charged, will then attract and pull free electrons from plate E to plate D. As a result, plate D becomes negatively charged and plate E becomes positively charged by […]