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Last updated date: 25th Nov 2023
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Is current density a scalar or a vector quantity?

Now, we will understand the current and current density. Current is produced when electric charge flows in a direction. Its unit is $Ampere$. The current is a scalar quantity. Now, we will be able to understand the concept of current density - The amount of current flowing in per unit area is known as the current density. It is the ratio of the amount of current flowing and the area of current flowing, the current density is represented as$J$and its unit is $Ampere/{m^2}$. Current density is a vector quantity because it’s a product of charge density and velocity, here charge density is a scalar quantity and velocity is a vector quantity, which makes current density also a vector quantity.
Note: Point to be note is, we should never think that unit of current density is $Ampere/{m^2}$, here $Ampere$ is the unit of current and ${m^2}$is the unit of area, current and area both are scalar quantities then the current density will also be a scalar quantity.