^Total energy density of EM waves
^Total energy density of EM waves Total energy (u) of EM waves ,
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^Magnetic energy density of EM waves
^Magnetic energy density of EM waves Magnetic energy density (uB) of EM waves is
^Electric energy density of EM waves
^Electric energy density of EM waves Electric energy density (uE) of EM waves is
^Speed of EM-waves
^Speed of EM-waves Speed of EM wave depends only upon the electric and magnetic properties of medium & is given by
^Equation of EM-waves
^Equation of EM-waves For an EM wave propagating along + X-axis is described by the mathematical functions EY = E0 sin (ωt – kx), EX = 0 & EZ = 0 & BZ = B0 sin (ωt – kx), BX = 0 & BY = 0
^Propagation of EM-waves
^Propagation of EM-waves EM waves propagate such that E & B vectors 1. are always in phase 2. vary sinusoidally at right angles to each other as well as it right angles to direction of (DOP) & thus EM waves are transverse. DOP is in the direction given by
^Deflection of EMwaves
^Deflection of EM-waves EM waves are neutral, thus can’t be deflected by E & B fields.
^History of EM waves
^History of EM waves In 1865 Maxwell predicted the existence of electromagnetic waves purely from theoretical consideration. He showed that an accelerating charge produce EM waves of wave frequency as that of the oscillating charge. In 1887, Hertz succeeded in experimentally confirming the existence of em waves. He sued an oscillatory LC circuit for producing […]
^Generating EM waves
^Generating EM waves Maxwell suggested an accelerating charge produces EM waves. An electric charge oscillating harmonically with time produces an oscillating electric field in its neighbourhood & this field in turn produces an oscillating magnetic in the neighbourhood. The process continues because the oscillating electric and magnetic fields act as sources of each other & […]
^Maxwell law
^Maxwell law Just as Faraday’s law tells us that a time-varying magnetic field produces an electric field, the Ampere-Maxwell law predicts that a time-varying electric field produces a current & magnetic field. This current is called Maxwell displacement current. Let is the rate of change of electric flux of through the area bounded by the […]
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