Physics

Problem

Calculate the radius of the circular path followed by an alpha particle (charge

+2e

, mass

6.64\times10^{-27}\,\text{kg}

) when it enters a uniform magnetic field of

0.20\,\text{T}

with a speed of

5.0\times10^{6}\,\text{m\,s}^{-1}

, its velocity being perpendicular to the field. Take

e = 1.6\times10^{-19}\,\text{C}