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What is the function of brushes in an el...

What is the function of brushes in an electric generator ?

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LAKHMIR SINGH & MANJIT KAUR-MAGNETIC EFFECT OF ELECTRIC CURRENT -Exercise
  1. What condition is necessary for the production of current by electroma...

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  2. What is the basic difference in the design of an a.c. generator and d....

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  3. What is the function of brushes in an electric generator ?

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  4. When a wire is moved up and down in a magnetic field, a current is in...

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  5. When current is 'switched on' and 'switched off' in a coil, a current ...

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  6. What is the major difference between the simple alternator and most pr...

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  7. List three sources of magnetic fields.

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  8. Two circular coils A and B are placed close to each other. If the curr...

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  9. (a) What is the difference between alternating current and direct curr...

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  10. State and explain Fleming's right hand rule.

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  11. Choose the correct option: A rectangular coil of copper wires is rot...

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  12. The phenomenon of electromagnetic induction is :

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  13. The device used for producing electric current is called a :

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  14. The essential difference between an AC generator and a DC generator is...

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  15. When the switch S is closed in the figure given below, the pointer of ...

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  16. Each one of the following changes will increase emf (or voltage) in a ...

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  17. An electric generator converts :

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  18. A d.c. generator is based on the priciple of :

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  19. An idduced emf is produced when a magnet is plunged into a coil. The m...

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  20. The frequency of direct current (d.c.) is :

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