Two singly ionised atoms

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

Two singly ionised atoms, each carrying charge

+e

, enter perpendicularly into the same uniform magnetic field of magnitude

0.30\,\text{T}

. Particle A has mass

m

and follows a circular path of radius

2.0\,\text{cm}

; particle B has mass

9m

and follows a path of radius

6.0\,\text{cm}

. If the kinetic energy of particle A is

8.0\,\text{keV}

, determine: (a) the ratio of the kinetic energies

K_B/K_A

of particles B and A; (b) the numerical value of

K_B

in kilo-electron-volts.