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    Question

    The best material for the core of a transformer is –

    A stainless steel Correct Answer Incorrect Answer
    B mild steel Correct Answer Incorrect Answer
    C hard steel Correct Answer Incorrect Answer
    D soft iron Correct Answer Incorrect Answer

    Solution

    Iron has a very large magnetic response: it greatly amplifies an applied magnetic field. The transformer's ability to transfer energy depends on the strength of the magnetic field, so it is very helpful if the field is amplified. The input energy can then be lower, while still having the same effect.

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