Current Density

Chapter-3|Current Electricity| NCERT 12th Physics:
Current Density:
The current density at any point inside a conductor is defined as the amount of charge flowing per second through a unit area held normal to the direction of the flow of charge at that point.

It is a vector quantity having the same direction as that of motion of the positive charge. It is a characteristic property of any point inside the conductor. It is denoted by j.

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