Physics

Problem

An electron traveling at a speed of

2.0\times10^{6}\,\text{m/s}

enters a region that contains mutually perpendicular uniform electric and magnetic fields. If the electric field magnitude is

1.0\times10^{4}\,\text{V/m}

and the electron is to pass through the region without deflection, what must be the magnitude of the magnetic field? a)

2.0\times10^{-2}\,\text{T}

2.0\times10^{-3}\,\text{T}

5.0\times10^{-3}\,\text{T}

3.3\times10^{-5}\,\text{T}