What is the radius of the circular orbit of an electron shot into a chamber with a uniform magnetic field of 6.5 G (1 G = 10 –4 T) at a speed of 4.8 × 10 6 m/s, normal to the field, given the electron charge (e = 1.5 × 10 –19 C) and mass (me = 9.1×10 –31 kg)?