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//chapter10,Example10_2,pg 271 R=0.35 n=1.38*10^7 m=1.67*10^-27 q=1.6*10^-19 B=(2*%pi*n*m)/q E=((B^2)*(q^2)*(R^2))/(2*m) E=E/q printf("magnetic field induction\n") printf("B=%.2f wb/m2",B) printf("\nmaximum energy of proton\n") printf("E=%.2f ev",E)