Formula: Circular Motion in the Magnetic Field Period Magnetic flux density (B-field) Electric charge Mass
$$T ~=~ 2 \, \pi \frac{ \class{brown}{m} }{ |q| \, \class{violet}{B} }$$
$$T ~=~ 2 \, \pi \frac{ \class{brown}{m} }{ |q| \, \class{violet}{B} }$$
$$\class{violet}{B} ~=~ 2 \, \pi \frac{ \class{brown}{m} }{ |q| \, T }$$
$$|q| ~=~ 2 \, \pi \frac{ \class{brown}{m} }{ \class{violet}{B} \, T }$$
$$\class{brown}{m} ~=~ \frac{ |q| \, \class{violet}{B} \, T}{ 2 \, \pi }$$
Period
$$ T $$ Unit $$ \mathrm{s} $$
Time needed for the charge in the magnetic field to make exactly one revolution.
Magnetic flux density (B-field)
$$ \class{violet}{B} $$ Unit $$ \mathrm{T} $$
Magnetic flux density, which indicates how strong the external magnetic field is in which the charge is orbiting.
Electric charge
$$ |q| $$ Unit $$ \mathrm{C} $$
Magnitude of a positive or negative, circling charge. Sign of the charge makes no sense here, because otherwise the time would be negative.
Mass
$$ \class{brown}{m} $$ Unit $$ \mathrm{kg} $$
Mass of the charged particle.