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Why are carbon brushes used?How do these...

Why are carbon brushes used?How do these work?

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CHETANA PUBLICATION-EFFECTS OF ELECTRIC CURRENT-EXAMPLE
  1. Give Scientific reasons: For electric power transimssion,copper or a...

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  2. Give Scientific reasons: In practice the unit KWh is used for the me...

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  3. Why are carbon brushes used?How do these work?

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  4. Give Scientific reasons: Iron is a conductor of electricity, but whe...

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  5. Give Scientific reasons: The material used for making fuse wire has ...

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  6. If lines of force pasing thrugh the coil are increased,will current be...

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  7. What is overloading?

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  8. How does short circuit form?What is its effect ?

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  9. What is Solenoid?Compare the magnetic field produced by a solenoid wit...

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  10. Describe with a neat diagram : Volmeter

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  11. How can we write mechanical power in a manner similar to the electrica...

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  12. Derive joules Law with the help of a neat circuit diagram.

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  13. In the aobve circuit,if the resistor is replaced by a motor,in which f...

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  14. How will you increase the strength of magnetic field in an electromagn...

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  15. Write a note on Galvanometer.

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  16. What do you mean by earthing?

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  17. State the factors on which the strenght of the magnetic field of a cir...

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  18. Which of the statement given below correctly describes The magnetic...

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  19. Which of the statement given below correctly describes Electromagn...

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  20. State the rule you will use: To find directio of the motion of a condu...

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