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State two ways by which the speed of rot...

State two ways by which the speed of rotation of an electric motor can be increased.

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The speed of rotation of an electric motor can be increased by:
(i) increasing the strength of the current,
(ii) increasing the number of turns in the coil.
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PRADEEP-MAGNETIC EFFECTS OF ELECTRIC CURRENT-Short Answer Questions (Additional)
  1. What is the role of the split-ring in an electric motor?

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  2. A DC motor is rotating in clockwise direction. How can the direction o...

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  3. State two ways by which the speed of rotation of an electric motor can...

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  4. (a) What is a natural magnet? (b) What is an artificial magnet?

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  5. (a) What is the nature of the magnetic field inside a solenoid? (b)...

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  6. (a) Which force is independent of the state of rest or of motion of a ...

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  7. (a) How does the magnetic field (B) due to a straight conductor vary w...

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  8. (a) Name a material of which permanent magnets are made? (b) Which o...

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  9. What are the two main systems of wiring commonly used in household cir...

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  10. Explain the significance of the following in a house circuiting. (i) k...

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  11. State the principle of an AC generator. What determines the frequency ...

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  12. What is a switch and how is it connected?

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  13. What is the role of each of the three pins in a power plug?

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  14. State two serious hazards of electricity.

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  15. What the two main precautions to be taken while using an electric supp...

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  16. What is the role of magnetism in medical science?

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  17. (a) What type of energy changes into electrical energy in electromagne...

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  18. (a) Which polarity is developed on the face of the solenoid when a nor...

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  19. (a) Which is more dangerous: AC or DC? (b) Why so?

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  20. (a) Can we use AC for electroplating? (b) Can we operate an AC elect...

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