Electromagnetic oscilation

Inductive proximity sensors are widely used in various applications to detect metal devices. They consist of an oscillator, trigger, and switching amplifier. If a metal object enters the electromagnetic field of the oscillator coil, eddy currents are induced in this coil which change the amplitude of oscillation, which causes the trigger stage to trip and the semiconductor output stage to switch.

16p mr_thanhhung 19-05-2012 351 90   Download

Interference and diffraction of light are arguments for wave charactiristics of light. We know that there are two types of wave processes: transverse & longitutional waves →to what are light waves belong ? Study of polarization of light makes clear that This conclusion is in according to the concept that light waves are electromagnetic waves with a definte band of frequencies. Recall that electromagnetic waves are transervse waves in which e-vectors & m-vectors oscillate in such follwing directions...

20p thanhan 22-07-2009 166 13   Download

We have known the close connection between changing eletric fields and magnetic fields. They can create each other and form a system of electromagnetic fields.  Electromagnetic fields can propagate in the space (vacuum or material environment). We call them electromagnetic waves. They play a very important role in science and technology.

49p thanhan 22-07-2009 140 21   Download