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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current1 Mark
MCQ
Commercial electric motors do not use:
    • A
      An electromagnet to rotate the armature.
    • B
      Effectively large number of turns of conducting wire in the current carrying coil.
    • C
      A permanent magnet to rotate the armature.
    • D
      A soft iron core on which the coil is wound.
    ✓

    Answer

    1. A permanent magnet to rotate the armature.

    Explanation: Electromagnet is used instead of permanent magnet in commercial electric motor.

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