clear
//Given
q=1.6*10**-19                  //c
B=0.1                          //T
v=5.0*10**6                      //m/s
a=90                           //degree

//Calculation
//
Fm=q*v*B*sin(a)

//Result
printf("\n Force on the proton is %0.1f *10**-14 N",Fm*10**14)