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What Magnetic field is generated

  1. Apr 16, 2013 #1
    If am using a flat spiral coil and giving sinusoidal voltage signal to it. i want to find the field generated at a point which is located at d cms from the flat spiral coil how can i get it? and also if am using another flat spiral coil at distance d cms what is the voltage induced in it..?
     
  2. jcsd
  3. Apr 16, 2013 #2

    Dale

    Staff: Mentor

  4. Apr 16, 2013 #3
    Thank you DaleSpam,

    Actually i thought of it but had doubt whether we can use it or not, if it is correct method to proceed or not..
     
  5. Apr 16, 2013 #4

    Dale

    Staff: Mentor

    The Biot-Savart law is an approximation for the magnetostatic case. Strictly speaking, your coil is not magnetostatic, but as long as the size of the coil divided by c is small relative to the period of your voltage then the approximation is fine.
     
  6. Apr 16, 2013 #5
    Am confused little bit what do you mean when you are telling coil divided by c.. can you explain it clearly...
     
  7. Apr 16, 2013 #6

    Dale

    Staff: Mentor

    Suppose your coil is 1 m in diameter. 1 m / (299792458 m/s) = 3.3 ns So if the period of your sinusoidal voltage is much greater than 3.3 ns (i.e. frequency much < 300 MHz) then the approximation should be fine.
     
    Last edited: Apr 16, 2013
  8. Apr 16, 2013 #7
    Yeah understood but the coil which am going to use will be 8cms, for that case we approximation will be fine nah
     
  9. Apr 16, 2013 #8

    Dale

    Staff: Mentor

    Yes, in that case you should be OK to use Biot-Savart up to 900 MHz or so.
     
  10. Apr 16, 2013 #9
    K thank you sir, hope i will get positive result if i have doubt i will be back to you
     
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