Aball is right - there always is a time delay in all Inductive and/or Capacitive circuits with AC signals passing through them. This is because the electromagnetic/electrostatic fields induce a counter voltage back in the wire After the original signal has passed. A good example is when you pull the plug on a running vacuum cleaner, you get a spark at the socket because the magnetic field collapses when you pull the cord and it induces a high voltage in the wire. Also, this is basically how your computer monitor gets its high voltage to power the CRT.
