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  3. 12th Class
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  5. Electro Magnetic Induction

12th Class Physics Electro Magnetic Induction Question Bank MCQs - Electromagnetic Induction

  • question_answer
    An inductor and a bulb are connected in series with a dc source. A soft iron core is then inserted in the inductor. What will happen to intensity of the bulb?

    A) Intensity of the bulb remains the same.

    B) Intensity of the bulb decreases.

    C) Intensity of the bulb increases

    D) The bulb ceases to glow.

    Correct Answer: B

    Solution :

    Option [b] is correct Explanation: When a soft iron core is inserted in the inductor, the magnetic flux increases According to Lenz's law, it will be resisted by reducing the current. Since the current reduces, the intensity of the bulb decreases.


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