Two Single Charged Ions Moving Perpendicularly to a Uniform Magnetic

Multiple Choice

Two single charged ions moving perpendicularly to a uniform magnetic field (B = 0.40 T) with speeds of 5 000 km/s follow circular paths that differ in diameter by 5.0 cm.What is the difference in the mass of these two ions?

A) 2.6 *10 ^{- 28} kg
B) 6.4 *10 ^{- 28} kg
C) 3.2*10 ^{- 28} kg
D) 5.1*10 ^{- 28} kg
E) 1.1 *10 ^{- 28} kg