Which of the following statements best describes the difference between electric and magnetic fields?
I. An electric field is essentially a force field that is created around an electrically charged particle. A magnetic field is one that is created around a permanent magnetic substance or a moving electrically charged object.
II. The strength of the magnetic field is represented by either gauss or Tesla. The strength of an electric field is represented by Newton per Coulomb or Volts per Meter.
III. Magnetic fields are created whenever there is a flow of electric current. An electric field occurs wherever a voltage is present.
a. I and III
b. I, II, and III
c. I and II
d. II and III