An electron of mass `9 xx 10^(-31)kg` moves in a circle of radius 2cm with a speed of `3 xx 10^(6)m//s` in a magnetic field. If a proton of mass `1.8 xx 10^(-27)kg` were to move in a circle of the same radius in the same field, its speed would be

Options

A. `6 xx 10^(4)m//s`
B. `1.5 xx 10^(4)m//s`
C. `6 xx 10^(3)m//s`
D. `1.5 xx 10^(3) m//s`

Answer

D