The north pole of one bar magnet is near the south pole of another bar magnet. What happens to the magnets?
A. They twist away from each other.
B. They repel each other
C. They attract each other.
D. They neither attract nor repel each other.

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc