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Commercial electric motors do not used:...

Commercial electric motors do not used:

A

An electromagnet to rotate the armature.

B

Effectively large on, of turns of conducting wire in the current carrying oil

C

A permanent magnet to create the armature.

D

A soft iron core on which the coil is wound

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MODERN PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-EXERCISE
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  3. Commercial electric motors do not used:

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  7. An AC generator is connected to an electrical appliances. In 10 revolu...

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  8. An electron enters in a magnetic field at right angle to its shown in ...

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  9. The magnetic field at the centre of a current carrying circular coil d...

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  10. The direction of magnetic field at a point near a current carrying con...

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  11. A dynamo

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  12. An induced emf is produced when a magnet is plunged into a coil. The m...

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  13. The frequency of AC means in India is

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  14. An electrical bulb rated 220 V is connected to 220v, 5Hz AC source. Th...

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  15. When a charged particle moves perpendicular to a magnetic field, then

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  16. A straight wire of mass 200 g and length 1.5 m carries a current of 2 ...

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  17. The magnetic field at a distance r from a long wire carryimg current I...

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  18. A long solenoid carrying a current produces a magnetic field B along i...

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  19. The device used for producing electric current is

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  20. At the time of short circuit,the current in the circuit.

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