A proton (charge +1.60 × 10⁻¹⁹ C) and an electron (charge -1.60 × 10⁻¹⁹ C) are both moving in the zy-plane with the same speed, 3.70 x 10⁵ m/s. The proton is moving in the +y-direction along the line z = 0, and the electron is moving in the -y-direction along the line x = +3.00 mm. At the instant when the proton and electron are at their closest approach, what is the magnitude of the magnetic force that the proton exerts on the electron?