5. *Radiation reaction force. Consider an electron that would execute simple harmonic motion at angular frequency w in the absence of a radiation reaction force. For what value of wy is the simple harmonic restoring force equal to the radiation reaction force? [Answer: 2.5 x 10%2.] What portion of the electromagnetic spectrum does this correspond to? 6. *Antenna directionality. Calculate the gain and beam width for the radiation pattern produced by a magnetic dipole antenna