# Equations to Simulate Electromagnetic Field Readings

• Gibdo
In summary, the inverse square law can be used to calculate electric potentials, and to measure the field in one point, it is necessary to know the amplitude (mG or T), direction of electric and magnetic fields, and the frequency (spectrum). Sensors for (electro)magnetic fields also need to know the amplitude.
Gibdo
I'm trying to program an application to simulate various readings of electromagnetic fields from any type of appliance or energy source. This part of physics was always my weakest. I don't remember any equations to use to get this data. The only thing I can remember is that it is related to the Inverse Square Law of some sorts. I've did many searches online, but I've seen so many different equations used, and I've tested several of them with inconclusive results. I don't know which to go by.

(I've seen some posts on here too, but I can't make sense of them. Not sure if those particular equations were what I needed)

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Your question is so vague that I don't think it is possible to give a useful answer.
The inverse square law can be interesting if you want to calculate electric potentials.

To be honest, I'm not sure how to be less vague. Essentially you have electromagnetic field readers that will pick up strengths of electromagnetic fields from microwaves, clock radios, power lines, etc The output is displayed in mG or T. I just want to know the how they work, so I too can simulate that on a computer program. So if I were to read in amps and/or volts I would get a specific reading at x distance.

The field around a point charge for example, I'm assuming is E = kQ/r$^{2}$? k being the constant 9x10$^{9}$
If I = Q/t, then it would be E = k(It)/r$^{2}$? E would be N/C or V/m. But I'd need to convert to G or T after that.

Am I following this correctly? And how does this compare for appliances that are on vs off? Shouldn't we get higher readings from things that are actively running?

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Do you want to simulate the measurement of such a probe, or the electromagnetic field in some volume?

All those sources you mentioned are sources of alternating magnetic fields. To fully measure the field in one point, it is not sufficient to know the amplitude (mG or T). You also need the direction of electric and magnetic fields and the frequency (spectrum).

Sensors for (electro)magnetic fields

mfb said:
it is not sufficient to know the amplitude (mG or T)
EMF meters display an output in mG/T though, which is what I'm wanting to mimic in my computer program. I was trying study the mathematical computations those meters do to understand them better.

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EMF meters displaye an output in mG/T?
Depends on the measurement device.

I'm wanting to mimic that in my computer program.
And what data do you have available? If you have the electromagnetic fields, just take their amplitude. Note that some devices can be sensitive to the direction of the fields, so you can get a lower measurement if you measure the "wrong" direction.

I was trying study the mathematical computations those meters do to understand better.
That depends on the type of measurement device you have.

I don't physically own a device or have one that I'm using. But considering, we could use everyday objects, I'd have access to whatever information is printed on their labels (Amps, Volts, Frequency (Hz), and Watts)

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Everyday objects won't give you a reliable measurement of alternating electromagnetic fields.

Which labels? Do you mean the data about the power supply they need?

Most appliances usually have a sticker on the inside or the side of them that lists data about the amount of Amps, Volts, or Watts that the appliance uses. I apologize, this is not my field of expertise.

Perhaps it could be easier for us to understand what you want if you gave us a complete use case of your application.

Its a single axis emf meter. I want simulate this device. I have to make a program that I put in data that I can get off these labels on appliances, and get a rough estimated emf reading from said appliance. So if this A/C in the window has a sticker on it has various info, like 115 volts, 4.8 amps, 525 watt input... I could enter this data in a field, and calculate a reasonably correctly emf reading from that appliance. I really can't be any more descriptive. I'm not trying to be confusing, but I honestly don't know what else is requested here.

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I am afraid your objective is not achievable. Any two appliances with identical AC input requirements may have very different emission profiles.

Well then, that's discouraging news to hear. Oh well, I appreciate the help none the less.

## 1. What are equations used for simulating electromagnetic field readings?

Equations are mathematical expressions that describe the relationship between electric and magnetic fields. They are used to simulate and predict the behavior of electromagnetic fields in different scenarios.

## 2. How are these equations derived?

The equations used to simulate electromagnetic fields are derived from Maxwell's equations, which are a set of fundamental laws that describe the behavior of electric and magnetic fields.

## 3. What factors do these equations take into account?

These equations take into account various factors, such as the strength and direction of the electric and magnetic fields, the distance between objects, and the properties of the materials involved.

## 4. Can these equations be applied to real-world scenarios?

Yes, these equations can be applied to real-world scenarios to simulate and analyze the behavior of electromagnetic fields. They are used in various fields, such as engineering, physics, and telecommunications.

## 5. Are there any limitations to using equations for simulating electromagnetic fields?

While equations are a useful tool for simulating electromagnetic fields, they may not always accurately predict real-world scenarios due to the complexity and variability of electromagnetic interactions. Other factors, such as external interference, may also affect the accuracy of the simulations.

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