J & K CET Medical J & K - CET Medical Solved Paper-2000

  • question_answer
    The expression for the induced emf contains negative sign \[\left( E=\frac{-d\theta }{dt} \right).\] What is the significance of negative sign?

    A)  The induced emf is produced only the negative flux decreases

    B)  The induced emf opposes the change in the magnetic flux

    C)  The induced emf is opposite to the direction of the flux

    D)  None of the above

    Correct Answer: B

    Solution :

                    From Faradays second law of electromagnetic induction, also known as Lenzs law, the direction of induced current in a circuit is such as to oppose the very cause which produces it. This is signified by the negative sign, in the expression for induced emf.


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