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animesh184
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The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain
please explain
animesh184 said:The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain
Electric intensity, represented by E, is a measure of the strength of an electric field at a given point. It is a vector quantity, meaning it has both magnitude and direction. On the other hand, current density, represented by j, is a measure of the amount of electric current flowing through a unit area. It is also a vector quantity and is related to electric intensity through Ohm's law.
Electric intensity and current density are related through Ohm's law, which states that the current density is directly proportional to the electric intensity and inversely proportional to the specific resistance of the material. Mathematically, this can be represented as j = σE, where σ is the specific resistance.
Specific resistance, represented by k, is a measure of the resistance of a material to the flow of electric current. It is also known as resistivity. It is measured in ohm-meters (Ω·m) and can be calculated by dividing the resistance of a material by its cross-sectional area and length. It is a characteristic property of a material and varies depending on factors such as temperature, composition, and impurities.
The specific resistance of a material directly affects the electric intensity and current density. A material with a higher specific resistance will have a lower electric intensity and current density, meaning it will be more resistant to the flow of electric current. This is because the higher resistance of the material will impede the flow of electrons, resulting in a lower current density and electric intensity.
Electric intensity, current density, and specific resistance have many applications in our daily lives. They are used in electronic and electrical devices such as computers, smartphones, and appliances to control and measure the flow of electric current. They also play a crucial role in the design and functioning of circuits, power grids, and other electrical systems. Additionally, these concepts are important in understanding and predicting the behavior of lightning and other electrical phenomena in the atmosphere.