NEET  >  Current Density

# Current Density Video Lecture - Physics Class 12 - NEET

## Physics Class 12

154 videos|444 docs|185 tests

## FAQs on Current Density Video Lecture - Physics Class 12 - NEET

 1. What is current density?
Ans. Current density is a measure of the amount of electric current flowing through a unit area of a conductor. It is defined as the ratio of the electric current passing through a specific cross-sectional area of a conductor to that area.
 2. How is current density calculated?
Ans. Current density (J) can be calculated by dividing the magnitude of the electric current (I) passing through a conductor by the cross-sectional area (A) of the conductor. Mathematically, J = I/A.
 3. What are the units of current density?
Ans. The units of current density depend on the units of electric current (I) and cross-sectional area (A) used in the calculation. Common units include amperes per square meter (A/m^2) or amperes per square millimeter (A/mm^2).
 4. What factors affect the current density in a conductor?
Ans. The current density in a conductor can be influenced by several factors, including the magnitude of the electric current, the cross-sectional area of the conductor, and the material properties of the conductor such as its resistivity. Additionally, factors like temperature and external magnetic fields can also affect current density.
 5. How is current density related to resistance?
Ans. Current density and resistance are related through Ohm's law. According to Ohm's law, the current passing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. Since current density is calculated using the magnitude of the electric current, it indirectly takes into account the resistance of the conductor. Therefore, higher resistance can result in lower current density for a given amount of current.

## Physics Class 12

154 videos|444 docs|185 tests

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