Final answer:
The magnitude of the resultant magnetic force on the alpha particle is 3.84x10^-13 Newtons.
Step-by-step explanation:
The magnitude of the resultant magnetic force on the alpha particle can be calculated using the formula:
F = qvB
Where F is the force, q is the charge of the particle (in this case, the charge of an alpha particle is twice the charge of a proton), v is the velocity of the particle, and B is the magnetic field intensity.
Plugging in the values, we have:
F = (2*q)*(v)*(B)
F = (2*(1.6x10^-19 C))*(820.0 m/s)*(1.20 Tesla)
F = 3.84x10^-13 N
The magnitude of the resultant magnetic force on the alpha particle is 3.84x10^-13 Newtons.