Recent content by d.arbitman

I've read that, but I then have a dilemma with the textbook examples of Faraday cages saying that internal (to the case) electric fields are zero if the case is placed in an external electric field. Quote from reply #2: Now for electromagnetic waves, a perfectly electrically conducting...

As a thought experiment, if I had an electronic circuit (powered by batteries) sitting in sealed metal case and that metal case was not electrically connected to the circuit's ground, would the shield not provide shielding from EM radiation/noise to the electronic circuit?

I read it, twice. But I'm not sure that Fig 8 applies. Fig 8 has a series source that is still referenced to the circuit ground. Would a Faraday cage, floating in mid air still provide a shield for electronic equipment inside? If I leave a shield floating, not connected to anything, does the...

Shielding -- Need to ground an electrostatic shield? I am reading this app note by analog devices: http://www.analog.com/static/imported-files/application_notes/41727248AN_347.pdf At the bottom of the first page it says: "An electrostatic shield, to be effective..." "But grounding the...

Thank you, I mean it. I just copied the variables from one of my engineering textbooks which omits the derivation. I didn't even know that in mathematics that there's a capitalization convention. I'm used to lower case for small signals and upper case for DC (+AC).

How do I handle the fractional parts? or do I split the numerator into two?

Yes, the higher order terms are minuscule and it's okay to discard them for hand analysis. How would I go about performing long division to achieve an infinite series? I've never done it. Thanks.

Solved. There's a series expansion and the two terms I listed are just the first two terms of the series.

You're correct. I revised the expression to make sense.

What is the name and where can I find the derivation for the following approximation? (X-(ΔX/2)) / (X+ (ΔX/2)) ≈ 1- ΔX/X Assuming ΔX << X, and X = (X1 + X2) / 2 and ΔX = X1 - X2 Thanks fellas! EDIT: Revised the expression.

I went through this exact process but had difficulty seeing how it would BEGIN oscillating. The moment when power is applied, what exactly happens to the crystal? (i.e. Does it begin deforming? Does it fight back with an opposite E field?)

Hello folks, I've been trying to understand how crystals work in crystal oscillator circuits. I understand the piezoelectric effect to the following extent: If we apply an electric field to the crystal it will deform and when the field is removed, the crystal will generate an electric field...

Homework Statement Please see attached for problem statement and table of bond energies. My chemistry background is awful and this is from a materials science textbook. The question is, how would I approach/solve 2.31 (only parts b and c).Homework Equations The Attempt at a Solution We go from...

This. Is. Awesome. He is an example of another Faraday. Science through experimentation.

You're probably right. What do you suggest I read?