Commercial electric motors do not use

  • A
    an electromagnet to rotate the armature
  • B
    a permanent magnet to rotate the armature
  • C
    effectively large number of turns of conducting wire in the current carrying coil
  • D
    a soft iron core on which the coil is wound

Explore More

Similar Questions

What is the difference between a direct current and an alternating current? How many times does $AC$ used in India change direction in one second?

On which principle does an electric generator work?

What happens if a full circular ring is used instead of a split ring (commutator) in an electric generator?

The diagram below shows a circuit containing a coil wound over a long and thin hollow cardboard tube. Copy the diagram and:
$(i)$ Show the polarity acquired by each face of the solenoid.
$(ii)$ Draw the magnetic field lines of force inside the coil and also show their direction.
$(iii)$ Mention two methods to increase the strength of the magnetic field inside the coil.

What constitutes the field of a magnet?

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo