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

  • question_answer
    An iron-cored solenoid has self-inductance 2.8H. When the core is removed, the self-inductance becomes 2 mH. The relative permeability of the material of the core is

    A) 1400

    B) 1200

    C) 2800

    D) 2000

    Correct Answer: A

    Solution :

    Option [a] is correct Explanation: \[{{\mu }_{r}}=\operatorname{L}/{{L}_{0}}=2.8/(2\times 1{{0}^{-3}})=1400\]


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