Beta particles will:

a. bend toward the north pole of a magnet

b. bend toward the south pole of a magnet

c. not be affected by either pole of a magnet

Beta particles are electrons, which carry negative charge.

Charge isn't affected by magnets, unless it's moving.  If it's moving, THEN it's electric current, and current feels a force toward or away from magnets.  

This question doesn't say whether the beta particles are moving, so we have to assume that they're just laying there, and they don't even know that there's a magnet nearby.

So beta particles will not be affected by either pole of a magnet. (C)

1 the 4 is sig

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.