Recent content by mrmojorising

Then why does an AC circuit with a capacitor have AC current in it? The charges accumulate on the plates of the capacitor and create their own electric fields which oppose further charge being pushed. Is it the fact that capacitors have 2 oppositely charged plates which effictevly cancel out any...

not if you use a current clamp -- it can measure the current without forming a loop, using induction. http://en.wikipedia.org/wiki/Current_clamp

I never mentioned anything about a loop -- i just mean a straight length of wire, not a loop.

i wasn't clearn in my original statement below. i don't mean literally in front of your computer screen, and you can ignore the Earth's magnetic field. I am just trying to set up a situation where a wire is moving orthogonally to a constant magnetic field, and i was just referring to computer...

Say you have a conductor (a single straight wire) which goes from left to right across your computer screen and moves up and down in periodic motion in a constant magnetic field that goes into your computer screen (see diagram below). (note: you can ignore the computer screen, and you can...

I get it from the equation I_rms=v*omega*C. As D (the distance between the cacitor plates increases) to something like 1 m the circuit effectively becomes an open circuit, which means there's no return path. However as D increases to something like 1 meter C and thus I_rms decrease, but...

ok, so if you double the distance between the capacitor plates the capacitance halves. so I_rms=V/X_c where X_C=1/(omega*C) where I is rms current, X_c is capacitive impedance, C is capacitance, and omega is 2pi*frequency. So I_rms=v*omega*C. So double the distance of the capacitor...

capacitor question...(why does AC need a return path) say you have an ac power source (120 v) connected to a circuit which just has one parallel plate open air capacitor, with the plates separated by, say, 1 mm. you measure the current flowing through the circuit and you get some rms value...

Opposite charges are built up between lightning clouds and the earth, which creates a potential, which causes lightening. Say you had a voltmeter that could handle infinite current and with leads hudnreds of meters long, and you stuck one lead onto a cloud which is about to create lightning...