Please help me answer all the questions on this page and thoroughly explain how you got them

Use the following image to answer questions 1-3: Two particles move through a uniform magnetic field that is directed out of the plane of the page, The figure shows the paths taken by the two particles as they move through the field. The particles are not subject to any other forces or fields. 1. Which one of the following statements concerning these particles is true? A) The particles may both be neutral. B) Particle 1 is positively charged; 2 is negative. Particle 1 is positively charged; 2 is positive. Particle 1 is negatively charged; 2 is negative. E) Particle 1 is negatively charged; 2 is positive. 2. Assuming Particle 1 is traveling at 10 m/s with a mass of 0.3 kg, a charge of 2 C and a radius of curvature of 4 m. What is the strength of the Magnetic Field? (Hint: Particle 1 is travelling in a circle because it is experiencing a centripetal force: Fc=mv2/r ) 3. What would happen to the radius of curvature of Particle 1 if the mass were doubled? The radius would: a. Remain the same b. become 2 times larger c. become 1/2 times smaller d. become 4 times larger e. become 1/4th times smaller