Which statement best describes the movement of particles when a wave travels through a medium?

How would a small bar magnet be oriented when placed at position x?

Difference between series and parallel circuits

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?