Part A IP An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons, and has a mas alpha particles is injected with a speed of 1.3 × 105 m/s into a region with a vertical magnetic field of magnitude 0.180 T How long does it take for an alpha particle to move halfway through a complete circle? s of 6.64 x 10-27kg. A horizontal beam of Submit My Answers Give Up Part B If the speed of the alpha particle is doubled, does the time found in part A increase, decrease, or stay the same? O increase O decrease O stay the same Submit My Answers Give Up Part C Repeat part A for alpha particles with a speed of 2.6 × 105 m/s