Hall effect:

We get                                                   

The Hall coefficient can be found as

The unit of R_H is expressed as m³/C. This concludes that the type of charge carrier and its density can be estimated from the sign and the value of Hall co-efficient R_H. It can be obtained by studying the variation of V_H as a function of I for a given B.

The above equation also concludes that Hall effect differentiates between positive charges moving in one direction and negative charges moving in the opposite.