Electromagnetic induction near a generator

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Discussion Overview

The discussion revolves around the concept of electromagnetic induction, particularly in the context of placing a wire coil near a generator and the effects of varying magnetic fields on induced current. It includes theoretical considerations and practical applications related to generating electricity through induction.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Experimental/applied

Main Points Raised

  • One participant proposes that placing a wire coil in the magnetic field near a generator could induce current due to variations in the magnetic field when electricity is turned off.
  • Another participant agrees with the principle of induction but notes that well-designed generators and transformers utilize iron cores to minimize stray magnetic fields, which may limit the usability of induced currents.
  • A later reply asks about the necessary rotation speed of magnets to induce enough current to light a small bulb, indicating a practical interest in the application of the concept.
  • One participant suggests connecting an LED to a small motor from a battery-powered toy as a potential method to demonstrate induction.

Areas of Agreement / Disagreement

Participants generally agree on the principle of electromagnetic induction, but there are differing views on the practical implications and effectiveness of inducing current near a generator, particularly regarding the influence of iron cores and the specifics of implementation.

Contextual Notes

The discussion does not resolve the specifics of how much current can be induced or the exact conditions required for practical applications, leaving these aspects open for further exploration.

silvercrow
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Hi , i am a high school student ( class 10 ) and after reading about electromagnetic induction iwas thinking about what if u place a wire coil connected to a circuit in the magnetic field / near a generator ? Because electricity is turned of for a fraction of a second there will be great variation of magnetic field which would induce current in the coil ? Am i incorrect ?
 
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Yes, in principle. However, well-designed generators and transformers use iron cores to guide magnetic fields lines for maximum efficiency so that the stray magnetic field is very small and not really usable. It may be measureable, though.

http://en.wikipedia.org/wiki/Magnetic_core
 
M Quack said:
Yes, in principle. However, well-designed generators and transformers use iron cores to guide magnetic fields lines for maximum efficiency so that the stray magnetic field is very small and not really usable. It may be measureable, though.

http://en.wikipedia.org/wiki/Magnetic_core

oo thanks buddy but tell me how much rotation speed of magnets i need to induce a small amount of current like lighting a really small bulb ?
 
Connect an LED to a small motor from a battery powered toy.
 

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