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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.
  • ✓
    A permanent magnet to rotate the armature.
  • D
    A soft iron core on which the coil is wound.
✓

Answer

Correct option: C.
A permanent magnet to rotate the armature.
Electromagnet is used instead of permanent magnet in commercial electric motor.

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