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I Magnetic field due to a straight wire

  1. Oct 30, 2018 #1
    Can someone help me to understand some of these steps?
    Why can we write ##\frac{1}{R} = \frac{sin(\phi)}{R}## and ##y = - cot(g\phi)##? zcstZ7h.png
     
  2. jcsd
  3. Oct 30, 2018 #2
    The derivations are written. Which part didnt you understand exactly ?
     
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