Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [field-strength]

49 questions
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Small SMD components: are they really capable of withstanding high voltages?

You can easy find some SMD components which are pretty small for such a high voltage (500V @ 0805 package for example - crazy?!). 0805 case would have 1.3 mm distance between the contacts, so I doubt that this voltage would be normal under real…
Roman Matveev
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Significance of electric field for electromagnetic compatibility standards

All electromagnetic compatibility standards around the world for immunity to electromagnetic fields (radiated susceptibility test) mention the strength of electric field (V/m), but not the strength of magnetic field (T). An EM wave will have both…
Ronnie
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Conversion from dBm to Volt/ meter

I have no experience with electronics but I have a question. Actually I'm using a circuit for a project that is able to measure RF power at its input in dBm; the circuit provides the integration of a specific component, which is the IC LT5534. I'm…
L.Bas
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Magnetic field strength and flux density from hysteresis curve

I am trying to measure the magnetic hysteresis curve of a toroidal nanocrystalline ferromagnetic transformer core made of Nanoperm (datasheet linked) using the following circuit. Each of the windings (primary on input side and secondary on…
Vivek Subramanian
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EIRP and Radiated Field Strength

I have a question regarding Field Strength: I was told it is independent from the frequency, is that true? If so, why? Moreover, I came accross this equation for converting the Field Strength to EIRP, but I do not get where the 104.8 comes from:…
Salma07
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Is the field strength between 2 electrodes dependent in any way on the medium?

I want to apply a high voltage electric field to a particle. Provided the electrodes are at the same distance and relative location from the particle in any case, will it make a difference to the field strength (not asking about the current)…
Oliver Walters
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How strongly does patient movement affect the magnetic field in an MRI?

The magnetic field in an MRI is insanely stable due to a closed current loop in the superconductor. A normal conducting magnet would always have (in addition to a ridiculous power consumption) power line fluctuations in the field strength, which…
jusaca
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Skin effect of copper in a high-strength AC magnetic field

I'm trying to determine the thickness of copper foil required to construct an enclosure that attenuates a very fast-rising, very brief pulse of AC magnetic field at a frequency of 1 MHz and field strength of 133 A/m by 50 dB. Using the equation $$ A…
dcorsello
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Energies of the fields in a plane wave, attenuated and unattenuated

This is a combination of two of my previous questions (question 1 and question 2) which are related. I'm trying to learn both how energy is carried in the electric and magnetic components of a plane wave, and how those fields and energies are…
dcorsello
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\$2n\$ point charges on a circle at \$O\$, what's total electric field intensity \$\overline{E}\$ at \$\pm 1\mathrm{m}\$?

The problem reads is from a Schaum's Outlines of EMFT and reads: A total charge of \$1\mathrm{nC}\$ is equally distributed among \$2n\$ points which are placed equidistantly on a circle with \$1\mathrm{m}\$ radius centered at the origin in the…
MathCrackExchange
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Are those electric fields dangerous?

Is 8.6 amperes per meter, 70 microtesla, 0.70 gauss, 695 milligauss, safe on long time exposure? I am just worried.
Paul Delaunay
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Estimating Received Signal Strength of a DTV transmitter

Goal: Estimate the received signal level in dBm (where 0 dBm corresponds to 0.224 volts) on a spectrum analyzer for a given TV transmitter. Scenario: I have many details on the transmitter, including height, frequency, ERP, coordinates, etc. derived…
Matt Dale
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how do we get these three formulas from the definition? field strength

I believe these three equation in the figure are not the definition of field strength,and the definition of field strength is \$H=\frac{F}{m}\$,how do we get these three formulas from the definition? 1.\$B=\frac{\mu_0I}{2\pi d}\$, 2.…
shineele
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Pancake Coil Magnetic Field Strength

I am trying to measure the magnetic field strength of a pancake (flat) coil. I know the turns, inner radius, current, and frequency from an AC input and am trying to measure the magnetic flux so I can use faraday's law to measure EMF output in a…
Maanit
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How to convert A/m to dBμA/m?

Lets say I have -2 dBμA/m as a limit. How do I convert the magnetic field strength in A/m to dBμA/m? Is it as follows? $$20\cdot \log(\frac{ |H| }{10^{-6}})$$ Thank you!
Defindun
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