the number density of free electrons in a copper conductor is 8.5×10^28m^-3.how long does an electron take to drift from one end of a wire 3.0m long to it's other end? the area of cross section of the wire is 2.0×10^-6m^2 and it is carrying a current of 3.0A

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.