Passage in Mass Spectrometry, a Sample's Molecules Are Ionized in a a Vacuum

Passage
In mass spectrometry, a sample's molecules are ionized in a vacuum and then exposed to a uniform electric field created by a high-voltage plate in the acceleration chamber.  The electric field accelerates the ions until they arrive at the next section of the device, designated as the separation chamber.  In this section, the drifting ions are sorted by their mass-to-charge ratio (m/q) .The separation chamber in a time-of-flight mass spectrometer (TOF-MS) is linear and has no electric or magnetic fields.  The ions travel at a constant velocity through the chamber until they reach the detector.  The time it takes for an ion to reach the detector depends on its m/q ratio.
Figure 1  Time-of-flight mass spectrometerA magnetic sector mass spectrometer (MS-MS) has a curved separation chamber where a magnetic field is generated.  The magnetic field exerts a centripetal force on drifting ions, bending their trajectories into curved paths.  The radius of the curvature depends on the ion's m/q.
Figure 2  Magnetic sector mass spectrometerThe centripetal force (F) acting on a particle can be determined from its mass (m) and velocity (v) and the radius (r) of the curved path:F = mv²/rEquation 1
-In the MS-MS separation chamber, the direction of the magnetic force on a moving ion is:

A) perpendicular to both the ion's velocity and the direction of the magnetic field.
B) perpendicular to the ion's velocity and parallel to the direction of the magnetic field.
C) parallel to both the ion's velocity and the direction of the magnetic field.
D) parallel to the ion's velocity and perpendicular to the direction of the magnetic field.

Correct Answer:

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