why is the value of r2=r2-r1?..........( r2 is the vector from charge q1 to charge q2)... pls help......
thnx in advnce!!!!!!!!!
why is the value of r2=r2-r1?..........( r2 is the vector from charge q1 to charge q2)... pls help......
thnx in advnce!!!!!!!!!