/sci/ - Science & Math

>>14776314
>I have recently (about 2 months ago) discovered that touhou is a thing
you should read higurashi!
>has this board (or this thread at least) been always posting touhou pics
honestly i think only like half the /sqt/ are 2hus. i remember a while back, wemi stopped posting for a month because he got tricked into think hot water freezes faster than cold water.
>>14776319
this >>14764157 is not a stupid question. the last two threads didnt have it. its on the verge of becoming lost media.

>>14719771
>>14720174
electric fields are created by charges (static or moving), but magnetic fields are only created by moving charges (and/or moving observers).
the only thing either of these fields do is exert force, but they do it in slightly different ways.
>>14720025
if youre applying a low gate voltage ([math]V_{GS} < V_{DS} - V_T[/math]), then the current is obviously limited by the gate voltage.
>if I have a 100 ohm load with 10 volts, and I apply 50% of the saturation voltage to the gate, will I always get 50mA through the drain-source, or is it based on some fixed maximum amperage, so any gate voltage will give me the same result as long as it's a load drawing low enough current?
SPICE says its closer to 25mA. this is a question that unfortunately requires math to answer.
[math] \displaystyle
I_D = \frac{W}{L} \mu_n C_{ox} \left( V_{GS} - \frac{V_{DS}}{2} - V_T \right)V_{DS} \\
I_D = I_R = \frac{V_S}{100} \; \; \; \to \; \; \; V_S = 100I_R \\
V_{GS} = V_G - V_S = V_G - 100I_R \\
V_{DS} = V_D - V_S = V_D - 100I_R \\
I_R = \frac{W}{L} \mu_n C_{ox} \left( (V_G - 100I_R) - \frac{V_D - 100I_R}{2} - V_T \right) (V_D - 100I_R)
[/math]
im not going any further, but you can go ahead and make a guess of how fucked [math]\frac{\partial I_R}{\partial V_G}[/math] and [math]\frac{\partial I_R}{\partial V_D}[/math] must be
>>14720219
never, EVER, bring up electrons when the question was about electromagnetics. Maxwell died without ever knowing what an electron was.
>>14720328
the seasons are more or less reversed for the northern and southern hemispheres of the earth. this is because the seasons are caused by the earth tilting towards or away from the sun during different parts of its orbit. when the north pole is pointing towards the sun, the northern hemisphere is exposed to more sunlight so its gets hotter than the southern hemisphere which is pointed away and gets less sunlight. then the south pole points towards the sun and the situation is reversed.