Faraday’s laws of Electromagnetic Induction

Faraday’s laws of electromagnetic Induction
  • First Law
  • “Whenever the magnetic flux linked with a circuit changes , an e.m.f induced in it”


    ” Whenever the a conductor cuts magnetic flux an e.m.f is induced in that conductor.

  • Second Law
  • The magnitude of the induced e.m.f is equal to the rate of change of flux – linkages.


    Induced E . M . F at any instant. E= N dǿ/dt Volts

    where N – number of turns in the coil.

    dǿ/dt – rate of change of flux.

    Lenz’s Law

    The lenz’s law states that the currents which are induced due to electromagnetic induction are in such a direction as to oppose the cause produce them. This law gives the direction of the induced current

    Flemings Right Hand Rule

    Stretch out the right hand with first finger and the thumb mutually perpendicular to each other . If the first finger points in the direction of flux and thumb in the direction of motion of the generator, then the middle finger will point in the direction of the induced e. m. f.

    Electromagnetic Induction_flemings_right_rule_2

    Fleming’s Left Hand Rule

    Stretch out the left hand with first finger, middle finger and thumb at right angles to one another. If the first finger points in the direction of magnetic field ,middle finger points in the direction of current .then the thumb will points in the direction of the mechanical force of the conductor

    Electromagnetic Induction_ Laws_flemings_left_rule

    Force ,f=Bil Newtons

    Kirchhoff’s circuit laws
  • kirchhoff’s current law
  • “The Kcl states that in any electrical network the algebraic sum of all currents meeting
    at any node equals zero at any instant of time”

    Fig:kirchhoff’s current law

    Apply KCL to this figure.Current directed away from the node are taken as postive and the currents dorected towards nodes are taken as negative the current equation of the code is

    (-i1)+(-i2)+i3+(-i4)+i5= 0

  • kirchhoff’s Voltage law
  • “The KVL states that in any electric network, the algebraic sum of voltage drop of all braches
    forming a closed path (called loop) equal zero at any instant of time”.

    Fig:kirchhoff’s Voltage law

    The voltage drop in allop taken postive and voltage rises are taken as negative while writing KVL eguation

    -v1+v2+v3+v4+v5-v6= 0



    Hi, Myself Tony George. An Electrical Engineer by Education, a Software Developer by Profession and an Education Blogger by Passion. In the past, I had been working as an Engineer in KSEB. The knowledge that I have acquired I would like to share here with you. I will be happy if these articles can give you a way to your career growth. Feel free to contact me.

    6 Responses

    1. Having read this I believed it was rather informative. I appreciate you finding the time and energy to put this content together. I once again find myself spending a lot of time both reading and commenting. But so what, it was still worth it!

    2. Aswathi R says:

      Hi tony, i have been searching for assistant exam preparation materials since its notification, and couldn’t find such a helpful blog ever before…… Heartfelt thanks for your sincere effort and dedication.

    3. vivek says:

      thank u for preparing this blog and inspiring us

    4. Merin says:

      Thank you very much Tony…

    Leave a Reply

    Your email address will not be published. Required fields are marked *