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How can the speed of rotation of the arm...

How can the speed of rotation of the armature coil of an electric motor be increased ?

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Verified by Experts

The speed of rotation of the armature coil can be increased by increasing :
i] the strength of the magnetic field
ii] the number of turns in the coil
iii] the current in the coil
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ZEN PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT -Additional question section (Short answer [SA] type 1 questions)
  1. A horizontal power line carries a current from east to west direction....

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  2. What would happen to the direction of rotation of a motor, if i] t...

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  3. How can the speed of rotation of the armature coil of an electric moto...

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  4. Draw the diagram of a simple electric motor. Label the following parts...

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  5. In what way can the magnitude of an induced current be increased ?

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  6. State the factors on which the induced emf in a coil rotating in a uni...

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  7. If the speed of rotation of the armature of a generator is doubled, ho...

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  8. For the current-carrying solenoid shown, draw the magnetic field lines...

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  9. What kind of energy transformation takes place in an electric motor ? ...

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  10. What is the role of fuse used in series with any electrical appliance ...

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  11. Whay is the earth pin longer and thicker than live and neutral pins ...

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  12. Name the three types of wires used in domestic circuits and mention t...

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  13. Give two uses of a magnetic compass.

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  14. A freely suspended magnet always points along north-south direction. W...

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  15. What are magnetic field lines ? How is the direction of a magnetic fie...

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  16. What is the direction of magnetic field lines inside a bar magnet and ...

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  17. What does the degree of closeness of the field lines represent ?

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  18. Name the SI unit of magnetic field and define it.

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  19. Identify the poles of the magnet in the given Figures.

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  20. In the Figure, identify the poles marked P and Q as north pole or sout...

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