Physics

Problem

An electron (

m_e = 9.1\times10^{-31}\,\text{kg}

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

) enters a uniform magnetic field of

0.010\,\text{T}

at a speed of

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

, moving perpendicular to the field. The radius of its circular path is closest to a)

1.7\times10^{-2}\,\text{m}

3.4\times10^{-3}\,\text{m}

1.7\times10^{-3}\,\text{m}

1.7\times10^{-4}\,\text{m}