Current Density

Current density

• The current density at a point in the conductor is defined as the current per unit cross-section area.Thus if the charge is flowing per unit time uniformaly over the area of cross-section A of the conductor,then current density J at any point on that area is defined as
  J=I/A -(2)
  
• It is the characterstic property of point inside the conductor nor of the conductor as a whole
  
• Direction of current density is same as the direction of conventional current
  
• Note that current density is a vector quantity unlike electric current
  
• Unit of current density is Ampere/meter² (Am^-2)
  

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• Notes
  • Electric current
  • Current density
  • Drift Velocity & Relation with Current
  • Ohm's Law and Resistance
  • Resistivity & Conductivity
  • Colour code of carbon resistors
  • Combination of Resistors
• Assignment
  • Electric Current And resistance Multiple Choice questions
  • Electric Current And Resistance problems

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Class 12 Maths Class 12 Physics