In a mass spectrometer, a singly-charged particle (charge e) has a speed of 1.0 space cross times space 10 to the power of 6 space m divided by s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? left parenthesis e equals 1.60 space cross times space 10 to the power of negative 19 space end exponent C right parenthesis