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(a) What is the difference between alter...

(a) What is the difference between alternating current and direct current ?
(b) What type of current is given by (i) a dry cell, and (ii) a Power House generator ?

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Alternating Current and Direct Current|Questions

LAKHMIR SINGH & MANJIT KAUR-MAGNETIC EFFECT OF ELECTRIC CURRENT -Exercise
  1. List three sources of magnetic fields.

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

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

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

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

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  6. The phenomenon of electromagnetic induction is :

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

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

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

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

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  11. An electric generator converts :

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

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

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

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  15. The frequency of alternating current (a.c.) supply in India is :

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  16. When the magnet shown in the diagram below is movoing towards the co...

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  17. If you hold a coil of wire next to a magnet,no current will flow i...

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  18. The wire in Figure below is being moved downwards through the mag...

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  19. Two coils A and B of insulated to wire are kept close to each ...

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  20. A portable radio has a built in transformer so that it can work f...

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