Magnetic force:

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

The magnitude of the magnetic field, B:

$\overline{){\mathbf{B}}{\mathbf{=}}\frac{{\mathbf{\mu}}_{\mathbf{0}}\mathbf{qvs}\mathbf{i}\mathbf{n}\mathbf{\theta}}{\mathbf{4}\mathbf{\pi}{\mathbf{r}}^{\mathbf{2}}}}$

An electron and a proton are each moving at 795 km/s in perpendicular paths as shown in (Figure 1) .

**Part A**

Find the magnitude of the total magnetic force that the electron exerts on the proton.

**Part B**

Find the direction of the total magnetic force that the electron exerts on the proton.

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