Yes, I know that, too. Teslas. I'm looking at the first equation in the exercise itself. There's no \$B\$ there. What's in the brackets is unitless. On the left, I take it is \$\frac{\text{m}}{\text{s}}\$. On the right, before the brackets? The \$E_{_0}\$ is as you say. Does \$\frac{e}{m_e}\times E_{_0}\$ yield \$\frac{\text{m}}{\text{s}}\$?
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