#given
E=(200*100) #Electric field in V/m
B=0.2 #Magnetic field in T
B1=0.3 #Magnetic field in the main chamber in T
q=(1.6*10**-19) #Charge of the electron in coloumbs
m=(12,13) #Carbon isotopes C12 and C13
M=(1.67*10**-27) #AMU(Atomic Mass Unit) in kg
#Calculations
v=(E/B)
s=(2*v*(m[1]-m[0])*M*100)/(q*B1)
#Output
print"Seperation on photographic plate is ",round(s,4),"cm"