51. Two isotopes leave the slit at point S and into a magnetic field of magnitude 0.100 T pointing into the page, each has speed of 1.00x 106 m/s. The first one contain one proton and has a mass of 1.67 x 10-27 kg and the other contains a proton and a neutron and hasa mass of 3.34 x 10-27 kg. What is the distance that they could be separated when they strike a photographic plate?(e = 1.6 x 10-19C)
(A) 0.520 m
(B) 0.313 m
(C) 0.210 m
(D) 0.105 m
(E) 0.104 m