Why is there EMI and vice versa

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In summary, when current is passed through a conductor, a magnetic field is generated. This is due to the fact that a change in magnetic flux induces a current in the conductor, as observed and modeled by Maxwell's equations. The relationship between these two phenomena is a matter of debate, as they can both be fundamental assumptions in different theories.
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wierdo
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(1)why is magnetic field generated when current is passed through a conductor? :confused:
(2)why is current induced in a conductor by change in magnetic flux? :zzz:
 
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  • #2
Nobody knows. It is just something that is observed to happen, and that we know how to model using Maxwell's equations.
 
  • #3
A slightly different answer is also possible:
http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html#Length_Contraction

In a mathematically consistent theory, what explains what is a matter of taste, because everything is logically related. If we take Maxwell's equations as our fundamental assumptions (ie. not derived), then we can derive the theory of special relativity. On the other hand, if we take special relativity as our fundamental assumption, then we can derive at least some bits of Maxwell's equations. Hence my slightly different answers.
 

1. Why is there EMI (electromagnetic interference)?

EMI occurs when electromagnetic waves from one source interfere with the signals from another source. This can happen due to various factors such as electromagnetic radiation, electromagnetic induction, and conductive coupling.

2. What causes EMI?

EMI can be caused by a number of factors including electronic devices, power lines, wireless communication systems, or even natural phenomena like lightning. Any source that emits electromagnetic waves can potentially cause EMI.

3. How does EMI affect electronic devices?

EMI can cause disruptions in the functioning of electronic devices by interfering with the signals they receive. This can lead to errors, malfunctions, or even complete failure of the device. EMI can also decrease the efficiency and lifespan of electronic devices.

4. How can EMI be prevented?

EMI can be prevented by using shielding materials, proper grounding techniques, and by controlling the distance between different electronic devices. Shielding materials, such as metal enclosures, can block or reduce the amount of electromagnetic waves that reach the sensitive electronic components. Proper grounding helps to dissipate any unwanted electrical charges, reducing the risk of EMI. Keeping a safe distance between electronic devices can also prevent EMI by reducing the chances of electromagnetic waves interfering with each other.

5. Is EMI harmful to humans?

EMI is not harmful to humans in most cases. The levels of electromagnetic radiation emitted by electronic devices are usually very low and are not considered a health hazard. However, some people may experience discomfort or other symptoms due to EMI, which is known as electromagnetic hypersensitivity. In rare cases, high levels of EMI may cause interference with medical devices, so caution should be taken in certain environments such as hospitals.

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