ehild said:The radius is not 3.81*10-3 m. Check.
ehild
Electrical charge is a fundamental property of matter that describes the amount of electricity an object possesses. It can be either positive or negative, and objects with opposite charges are attracted to each other, while objects with the same charge repel each other.
Electrical charges are caused by the presence and movement of charged particles, such as electrons and protons. When these particles are in motion, they create an electric field which results in an electrical charge.
The SI unit for electrical charge is the Coulomb (C). One Coulomb is equivalent to the charge carried by approximately 6.24 x 10^18 protons or electrons.
Electrical charge is measured using a device called an electrometer. This device measures the amount of charge present on an object by detecting the electric field created by the charged particles.
According to the Law of Conservation of Charge, electrical charge cannot be created or destroyed. It can only be transferred from one object to another, or converted into another form of energy. This means that the total amount of charge in a closed system remains constant.