The force on the electron is:

$\overline{){\mathbf{F}}{\mathbf{=}}{\mathbf{q}}{\mathbf{(}}{\mathbf{v}}{\mathbf{\times}}{\mathbf{B}}{\mathbf{)}}{\mathbf{=}}{\mathbf{q}}{\mathbf{v}}{\mathbf{B}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{\theta}}}$

θ = 0° since the electron is moving parallel to the uniform magnetic field.

a). In the figure below, an electron is moving parallel to a uniform magnetic field in the direction shown. Is there a force on the electron; if so what direction does it point? Explain your reasoning.

b). In the figure below, an electron is moving perpendicular to a uniform magnetic field in the direction shown. Is there a force on the electron; if so what direction does it point? Explain your reasoning.

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