A beam of singly charged particles of ⁷Li moves through a uniform magnetic field at a speed of 4.0 km/s. A ⁷Li particle has a mass of 1.16 × 10^-26 kg. The magnetic field deflects the particles' beam, and the beam leaves the magnetic field region perpendicular to the initial direction of incidence. Determine the strength of the magnetic field if the distance traveled by the ⁷Li beam is 3.24 cm.