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clear;
clc;
printf("\nEx7.4\n");
//page no.-219
//given
e=1.6*10^-19;......//CHARGE IN C
R=-0.0125;..........//HALL COEFFICIENT IN m^3/coulumb
E=100;...............//ELECTRIC FIELD IN volt/m
mu=0.36;.............//mobility
n=1/(e*R).............//no. of charge carriers per m^3

J=n*e*mu*E............//current density in ampere/m^2

printf("\ncurrent density is 2880 A/m^2");