UPSC Physics Electric Current and Magnetism Question Bank Electricity, Magnetism and Light

  • question_answer
          Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must                                    [NDA]

    A) have different cross-sections

    B) have different temperatures

    C) be of different materials

    D) be of same density

    Correct Answer: C

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