An unknown charged particle is observed undergoing uniform circular motion in a magnetic field of

magnitude $0\mathrm{.}550$ T$.$ The radius of its orbit is observed to be $1\mathrm{.}081$ m$,$ and the period of the motion is

$2\mathrm{.}261$ x $107$ s$.$ If the particle is assumed to have the same charge as an electron, what is its mass?

a$)6\mathrm{.}589$ x $1027$ kg b$)2\mathrm{.}713$ x $1027$ kg c$)1\mathrm{.}064$ x $1027$ kg

d$)3\mathrm{.}171$ x $1027$ kg e$)$ none of the above f$)$ There is not enough information to tel