The electric intensity E, current density j and specific resistance k

Thread starter animesh184
Start date May 30, 2013
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Current Current density Density Electric Intensity Resistance Specific

In summary, electric intensity (E) is a measure of the strength of an electric field, while current density (j) is a measure of the amount of electric current flowing through a unit area. They are both vector quantities and are related through Ohm's law, where j = σE (with σ being the specific resistance). The specific resistance (k) is a measure of a material's resistance to the flow of electric current and is measured in ohm-meters. A higher specific resistance leads to a lower electric intensity and current density. These concepts have various real-life applications in electronic devices, circuits, power grids, and understanding atmospheric electrical phenomena.

May 30, 2013

animesh184

The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain

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May 30, 2013

TheFerruccio

animesh184 said:

The electric intensity E, current density j and specific resistance k are related to each other by the relation
please explain

Are you missing something in this post? This seems incomplete.

May 30, 2013

yungman

You are asking for a big portion of the book!

1. What is the difference between electric intensity and current density?

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.

2. How are electric intensity and current density related to each other?

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.

3. What is specific resistance and how is it measured?

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.

4. How does the specific resistance of a material affect electric intensity and current density?

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.

5. What are some real-life applications of electric intensity, current density, and specific resistance?

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.