Urgent! Lost. Please help thank you.

Part A The aurora is caused when electrons and protons, moving in the earth's magnetic field of ~ 5.0 x 10 5 T, collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit for an electron with speed 2.0x10 m/s ? Assume that the electron moves in a plane perpendicular to the magnetic field. Express your answer with the appropriate units. 3 5 + 0 ( ? Telectron = Value Units 4 Submit Request Answer Part B What is the radius of the circular orbit for a proton with speed 5.0x104 m/s ? Express your answer with the appropriate units. ? Tproton = Value Units Submit Request