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    Question

    What is the principle behind the working of a

    transformer?  
    A Faraday’s law of induction Correct Answer Incorrect Answer
    B Ohm’s law Correct Answer Incorrect Answer
    C Lenz's law Correct Answer Incorrect Answer
    D Coulomb’s law Correct Answer Incorrect Answer

    Solution

    A transformer works on Faraday's law of induction.   It uses electromagnetic induction to change the voltage in alternating current (AC) circuits.   A varying current in the primary coil induces a varying magnetic field, which in turn induces a current in the secondary coil.   This allows voltage to be increased or decreased.

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