Electromagnetic Induction - Self Induction


In above figure when current passing through the circuit and coil changes (increasing in our case) the magnetic flux linked with the coil also changes ,due to which an EMF will be induced in the coil(this phenomenon is called self induction) .This induced EMF and induced current will be in opposite direction(as current is increasing in our case) .

As the flux linked with the coil increases as current increases, hence flux linked with coil is directly proportional to current.
                                                               

remove proportionality sign and put constant L



Differentiate both sides wrt time

   -----equation 1


By Faraday's Law , Induced EMF is given by below equation


-----equation 2

Substitute value from equation 1 to equation 2



 

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Electromagnetic Induction - Mutual Induction

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As we have variable source with increasing current in primary coil ,there will be a flux change in primary coil. Due to this flux change in primary coil there will be a flux change in secondary coil and this flux change in secondary coil will generate induced emf in secondary coil. This is called mutual induction. flux linked with secondary coil depends on current in primary coil ,so they are directly proportional to each other. differentiate with respect to time both sides   ------equation 1 As per faraday law induced emf in secondary coil is  ------equation 2 substitute value from equation 1 to equation 2   Visit PHYSICS page for more blogs
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