<p>Why don’t metals, which are good conductors, conduct electromagnetic waves ? </p>
<p>My book says that when a car goes into a tunnel, it’s surrounded by metal that don’t let electromagnetic waves (which have electric and magnetic fields) penetrate…?? Why? So, if metals don’t let in electromagnetic waves, then how do they conduct electricity? If their electric field inside is zero, how do they conduct electricity??</p>
<p>Thanks.</p>
<p>…anybody there?</p>
<p>Metals do conduct radio waves. Radio waves are conducted through the metal into the ground. All antennas are made of metal. They conduct the radio signals into receivers. If an antenna is grounded at a point before it enters the receiver, the radio wave will pass into the ground instead of into the receiver. Ungrounded metal (such as a car body) don’t “block” radio waves.</p>
<p>So, are you saying: metals will conduct the radio waves, but because the “antenna is grounded at a point before it enters the receiver, the radio wave will pass into the ground instead of into the receiver” and so, you won’t hear anything from your radio?
I thought it was because there’s a Zero electric field inside the metal, the radio waves won’t pass…</p>