Question

is current density a vector or scalar quantity??...
give reason for your ans???​

Answer 1

Answer:

Current Density j is a vector quantity

j=di/dS

=> j= di * dS^-1 * cosx (here x is the angle b/w the direction of the current and the area vector)

Here j is the product of electric current and a small area (dS) through which the charges flow.

j is the product of a scalar and vector quantity

unlike electric current i, j is added vectorially (i has both magnitude and direction but is a scalar quantity as it can't be vectorially added)