## College Physics (4th Edition)

The magnitude of the magnetic field is $0.78~T$
We can find the magnitude of the magnetic field: $F = q~v\times B$ $B = \frac{F}{q~v}$ $B = \frac{1.0 \times 10^{-13}~N}{(-1.6\times 10^{-19}~C)(8.0\times 10^5~m/s)}$ $F = -0.78~T$ The magnitude of the magnetic field is $0.78~T$.