Why Are Coils Essential for Electricity and Magnetism?

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Discussion Overview

The discussion centers around the significance of coils in electricity and magnetism, exploring their role in generating electric charge when interacting with magnets, their use in generators, and the reasons behind their preferred shape in various applications. The scope includes theoretical concepts, practical applications, and basic electronics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the significance of coils, noting that pushing a magnet through a coil generates a charge, unlike touching it to a straight copper pipe.
  • Another participant asserts that coils do not conduct better than other shapes but utilize inductance differently than straight wires.
  • A participant mentions that inductance, capacitance, and resistance allow for the construction of frequency-selective circuits, highlighting the role of coils in this context.
  • It is noted that current flowing through a coil creates a magnetic field, with its strength proportional to the ampere-turns, suggesting that stronger coils require more current or more turns of wire.
  • One participant explains that coils interact with themselves, as the magnetic field generated by one segment of wire affects nearby segments, unlike a straight wire.
  • Another participant discusses the shape of the magnetic field produced by coils versus straight wires, indicating that coils generate a more manipulable magnetic field suitable for applications like motors.

Areas of Agreement / Disagreement

Participants express differing views on the significance of coils versus straight wires, particularly regarding their conductive properties and the nature of the magnetic fields they generate. The discussion remains unresolved with multiple competing perspectives presented.

Contextual Notes

Some claims rely on specific definitions of inductance and magnetic field interactions, which may not be universally accepted. The discussion does not resolve the complexities of these concepts or their applications.

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hey everyone, I have a questions, that is very general, and perhaps, silly... but why are coils so significant in terms of electricity and magnetic fields? why is it when you push a magnet through a coil, you get a charge, but not when you touch it to a straight copper pipe? Or when you see generators, they always use the coil form? What is it about a metal coil, that conducts better than any other shape?
 
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Coils don't conduct better than other shapes they just make use of inductance in a way that straight wires don't. This is really basic electronics and you'd learn more by studying it that getting a simple answer here.

I Googled "inductance in coils" and got a zillion hits.
 
Basically through inductance, capacitance, and resistance we can build circuits that are frequency selective. For example, read about resonance. Coils have inductance, which is what is special. Of course frequency selectivity is but one of the applications of circuits containing coils.
 
Another simple answer or point, other than it not being about conducting, is that current flowing in the coil creates a magnetic field, and the strength of the field is proportional to the ampere-turns. So a stronger coil needs more current or more turns of the wire.
 
I would say that the difference between a coil and a straight wire is that the coil interacts with itself, that is the field by generated by a given bit of wire is felt by other nearby bits of wire. The field generated by a straight wire does not cross the wire again.
 
It depends on the shape of the magnetic field you want to generate.

When current passes through a wire, it creates magnetic field that is circular around the wire.

While if you turn it in the shape of the coil as you mentioned you will get magnetic field in the shape of approximately straight lines which can be more easily manipulated for your application purpose.

In motors applications, the torque generated by 3 phase motor is the result of the cross product of magnetic field from stator and rotor, so if you have 2 straight magnetic fields you can easily find the torque resulted from the interaction of these 2 fields.
 

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