Final answer:
The correct answer is A. F will triple in magnitude if the magnetic field strength B is tripled, following the equation of magnetic force on a charged particle, assuming all other variables remain constant. In this case, the correct answer would be:A. F will triple.
Step-by-step explanation:
To answer the question about the effect on F if B is tripled while keeping the other values constant, we need to relate it to the physics law that describes the involved quantities. This is likely a reference to the magnetic force on a charged particle moving in a magnetic field, described by the equation F = qvB sin(θ), where F is the force on the particle, q is the charge, v is the velocity of the particle, B is the magnetic field strength, and θ is the angle between the velocity and the magnetic field. In this equation, if B is tripled and all other variables (q, v, θ) are kept constant, then the force F will also triple in magnitude. Therefore, the correct answer is A. F will triple.