A proton with a charge of magnitude \(1.6 \times 10^{-19} \text{ C}\) enters a uniform magnetic field of magnitude \(B = 0.20 \text{ T}\) directed perpendicularly into the page, as shown in the diagram. The proton travels horizontally to the right with a speed of \(v = 5.0 \times 10^5 \text{ m/s}\). Which of the following correctly pairs the magnitude of the initial magnetic force acting on the proton with the initial direction in which its path curves?