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Maxwell’s Equations

Maxwell’s Equations. In the electric field E, and the magnetic field B , a charge q will experience a force: the Lorentz force:. Electromagnetic. F = q{E + v × B}. Static Charges produces E fields and Moving charges produces B fields. Maxwell’s Equations. Electromagnetic.

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Maxwell’s Equations

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  1. Maxwell’s Equations In the electric field E, and the magnetic field B, a charge qwill experience a force: the Lorentz force: Electromagnetic F = q{E + v × B}. Static Charges produces E fields and Moving charges produces B fields

  2. Maxwell’s Equations Electromagnetic The effects may be summarized in the expressions for the divergence and the curl of E and B: divE = /, curlE = 0 , divB = 0 , curlB = µ0J

  3. Maxwell’s Equations Electromagnetic Equations without divergence and curl express passive aspects, while with curl and divergence express active aspects. A field with a curl but no divergence is called a solenoidalfield, while one with a divergence but no curl is called an irrotationalfield.

  4. Electrostatic Field Potential Distribution.

  5. Electrostatic Field Equipotentials and Electric Field Vectors of Electrostatic Field.

  6. Electric Field Vectors Equipotentials and Electric Field Vectors of aMicrostrip Line.

  7. Potential Distribution Potential Distribution associated with a Corner Resistor.

  8. Electric Field Magnitude Logarithmic scaled Electric Field Magnitude

  9. Electrodynamics A Charged Particle If a charged particle is set free in an electric field, it is accelerated by a force proportional to the field and charged particle F = qE Where F is Force q is a charge, and E is electric Field Intensity

  10. Electrodynamics Newton’s Second Law d(mv) dv dm F = = m + v dt dt dt Where m = mass of particle, kg V = velocity of particle, m-1

  11. Electrodynamics Newton’s Second Law F = m dv = ma dt ma = qE • Velocity is very small as compared to velocity of light • Mass is essentially constant

  12. Electrodynamics Energy Integrating the force over the distance traveled by charged particle is 2 2 W = m  a •dL = q E • dL 1 1 While the Integral of E between points of 1 and 2 is a potential difference V 2 W = m v •dv = qV 1 W = ½ m( v22 – v12) = qV

  13. Electrodynamics Particle Energy W = qV = ½ mv2 where W = energy acquired by particle, J v2 = velocity of particle at point 2, or final velocity, ms-1 V1 = velocity of particle at point 1, or initial velocity, ms-1 q = charge on particle, C m = mass of particle, kg V = magnitude of potential difference between points 1 & 2, V

  14. Electrodynamics Final velocity Considering a charged particle q starting from rest and passing through a potential of V, willattain the final velocity of :-  =  2qV/m

  15. Electrodynamics Final velocity While q = 1.6 x 10-19C falling through V = 1 volt Energy = 1.6 x 10-19 Joules m = mass of 0.91 x 10-30kg, will attain Velocity = v = 5.9 x 105 V at 1 volt the charge attains 590 kms-1

  16. Electrodynamics ay = qVd qVdL vy ; vy = ayt = ;  = tan-1 vx md mvxd L Vd y vy v Ed  vx d

  17. Electrodynamics Problem:- A CRT with Va = 1500V, Deflecting space d = 10mm, Deflecting plate length = 10mm, Distance x = 300mm, Find Vd to deflection of 10mm:- Deflection y = VdLx/2Vad Vd = 2Vady/Lx= 100 V

  18. Electrodynamics Moving particle in static magnetic field Force on a current element dL in a magnetic field is given by: dF = (I x B)dL (N) …Motor equation I = q/t IL = qL/t = qv IdL = dqv dF = dq(v x B) F = e(v x B) Lorentz force

  19. Electrodynamics Moving conductor in a magnetic field E = F/e = v x B V12 =  E • dL =  (v x B) • dL 2 2 1 1 1 Generating Equation B    dL   v          2 E = v x B

  20. Electrodynamics Magnetic Brake

  21. Electrodynamics Magnetic Brake I, B, & PUSH Therefore F due to I is opposing to PUSH Conductive Plate Magnet Assembly

  22. Electrodynamics Magnetic Levitation

  23. How does the LEVITRON¨ work? When the top is spinning, the torque acts gyroscopically and the axis does not overturn but rotates about the (nearly vertical) direction of the magnetic field.

  24. How does the LEVITRON¨ work? levitionta

  25. Electrodynamics levitation

  26. Electrodynamics levitation "We may perhaps learn to deprive large masses of their gravity and give them absolute levity, for the sake of easy transport." - Benjamin Franklin

  27. Electrodynamics Maglev Trains

  28. Electrodynamics Maglev Train A maglev train floats about 10mm above the guidway on a magnetic field. It is propelled by the guidway itself rather than an onboard engine by changing magnetic fields (see right). Once the train is pulled into the next section the magnetism switches so that the train is pulled on again. The Electro-magnets run the length of the guideway

  29. Electrodynamics Maglev Train Track

  30. Maglev Train Aerodynamics Brakes

  31. Electrodynamics Advantages: • no components that would wear out • there is no friction. Note that there will still be air resistance. • less noise • The final advantage is speed

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