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184_notes:ac [2018/08/09 19:17] curdemma184_notes:ac [2018/08/09 19:18] – [Voltage Transformer] curdemma
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 Because there is an oscillating potential/current in the first solenoid (from the generator), this will create a constantly changing magnetic field in the primary solenoid. Since the primary solenoid is wrapped around the iron bar, the magnetic field from the solenoid will cause all of the atoms within the iron to align with the magnetic field from the primary solenoid. Because iron atoms are very responsive to magnetic fields, even the atoms that are outside the primary solenoid will align with this magnetic field (largely because they are feeling the effects of their neighboring iron atoms). Since iron is easily magnetized, we will //__assume that the magnetic field in the iron from the primary solenoid will be the same magnetic field in the secondary solenoid__// (still in the iron ring). Because the magnetic field in the primary solenoid is oscillating, this means that the magnetic field in all of the iron ring is also constantly changing.  Because there is an oscillating potential/current in the first solenoid (from the generator), this will create a constantly changing magnetic field in the primary solenoid. Since the primary solenoid is wrapped around the iron bar, the magnetic field from the solenoid will cause all of the atoms within the iron to align with the magnetic field from the primary solenoid. Because iron atoms are very responsive to magnetic fields, even the atoms that are outside the primary solenoid will align with this magnetic field (largely because they are feeling the effects of their neighboring iron atoms). Since iron is easily magnetized, we will //__assume that the magnetic field in the iron from the primary solenoid will be the same magnetic field in the secondary solenoid__// (still in the iron ring). Because the magnetic field in the primary solenoid is oscillating, this means that the magnetic field in all of the iron ring is also constantly changing. 
  
-{{  184_notes:Week14_9.png?400}}+[{{  184_notes:Week14_9.png?400|Cross sectional area of the iron ring would be dA in our calculation}}]
  
 If we put the secondary solenoid on the end of the iron ring, this changing magnetic field will be the same as that from the primary solenoid: $B_P=B_S$. This changing magnetic field (from the primary solenoid) will induce a voltage ($V_S$) in the secondary solenoid. We can use Faraday's Law to write this as: If we put the secondary solenoid on the end of the iron ring, this changing magnetic field will be the same as that from the primary solenoid: $B_P=B_S$. This changing magnetic field (from the primary solenoid) will induce a voltage ($V_S$) in the secondary solenoid. We can use Faraday's Law to write this as:
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