Current density J is a vector quantity which is defined as the current flowing per unit area measured in a direction normal to the direction of flow of charge.
|J| = |I|/ A
Substituting the value of I and Vd in this equation |J| = |I|/ A ;
|J|= nAqVd / A
= nq. (qt|E|/ m)
|J| = (nq2t/ m).|E|
The vector J is parallel to the electric field vector.
In the above equation the quantity nq2t/ m is called conductivity σ.
|J| = (nq2t/ m).|E| = σ |E|
Hello
Current density J is a vector quantity which is defined as the current flowing per unit area measured in a direction normal to the direction of flow of charge.
|J| = |I|/ A
Substituting the value of I and Vd in this equation |J| = |I|/ A ;
|J|= nAqVd / A
= nq. (qt|E|/ m)
|J| = (nq2t/ m).|E|
The vector J is parallel to the electric field vector.
In the above equation the quantity nq2t/ m is called conductivity σ.
|J| = (nq2t/ m).|E| = σ |E|
Hope this helps
Thank you
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