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Problem 3) Proton moving in a magnetic field [40 points] A proton (charge e =1.6x10 "C, mass m=1.67x10 27kg ) moving at speed v =105 S enters a magnetic field B of magnitude B =0.1 T pointing into the paper plane as shown below. a) Find the radius r of the circular path of the proton in the magnetic field B. b) In which direction is the proton deflected when it enters the magnetic field B? XXXXXX XX XXXX +