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# Activity for MissMulan‭

Type On... Excerpt Status Date
Edit Post #287508 Initial revision 10 months ago
Question Magnetization as a function of temperature in ferromagnets
Suppose a ferromagnetic material with initial magnetization $Mo$.Is there some specific formula which calculates the total magnetization $M$ as a function of $M{o}$ and the Curie temperature $T{c}$?
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10 months ago
Edit Post #287450 Post edited:
10 months ago
Edit Post #287450 Initial revision 10 months ago
Question Direction of vector of electric field
Suppose we have a arc of charges with some charge density $\lambda(\theta) = sin\theta$.I am using polar coordinates for convenience.But how can I find the direction of the unit vector of the net electric field?In the previous example (the one with the line of charges)the direction of the net electri...
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10 months ago
Edit Post #287259 Initial revision 12 months ago
Question Maxwell equations EM wave confusion
The general formula for a EM wave (solving for the E field) is: ![](https://physics.codidact.com/uploads/5PPqUrHwND5jdpVT72cJqXZs) where $\varepsilon = \varepsilon {r}+j\frac{\sigma }{\omega }$ My professor told me that the conductivity of vacuum is 0 so we eliminate the term with the $... (more) 12 months ago Edit Post #286927 Initial revision about 1 year ago Question maxwell equation in 1d Maxwell's first law in differential form states that $$\triangledown \cdot E = \frac{\rho}{\epsilon{o}}$$ . In case of 1d can we say that $$\rho = \lambda$$ where $$\lambda$$ is the linear charge density of something? (more) about 1 year ago Edit Post #286925 Initial revision about 1 year ago Question Double slit experiment with 2 electrons fired from a gun Suppose we perform the double slit experiment , but we fire instead 2 electrons instead of 1. In the double slit experiment performed in the 1920s a interference pattern was observed at the screen which showed the electron-wave nature of any subatomic particle.The particle would start moving as a ... (more) about 1 year ago Edit Post #286923 Post edited: about 1 year ago Edit Post #286923 Initial revision about 1 year ago Question SI Units of wavefunction What are the SI units of the wavefunction Ψ(x).I know that [Ψ(x)]^2 describes the probabilty of finding a quantum object at a certain quantum state but what about the wavefunction instead? (more) about 1 year ago Edit Post #286906 Post edited: about 1 year ago Edit Post #286906 Initial revision about 1 year ago Question Differential equation solution cannot describe what happens in reality Suppose we have a free falling object inside a planet's gravitational field with strength g.The planet's atmosphere provides a drag force which is dependant from the u^2 of the particle. Suppose the weight of the object is m1g and the drag force due to the atmosphere is -ku^2 and lets say we set k... (more) about 1 year ago Edit Post #286898 Initial revision about 1 year ago Question Classical Uncertainty Suppose we are using a force gauge to measure gravity in a planet. We set the gauge force to the 1N range which has a resolution of .01 N. From its specs the error introduced during the measurment at the 1N range is 210^-3reading+10^-3range. Now suppose we perform 5 different measurements: ... (more) about 1 year ago Comment Post #286873 Im looking something in the newtonian mechanics region of study which is modeled by a system of ordinary differential equations. (more) about 1 year ago Edit Post #286869 Initial revision about 1 year ago Question System of ODEs models in physics What examples of a system can be described by a system of ordinary differential equations? (more) about 1 year ago Edit Post #286842 Initial revision about 1 year ago Question How are charges sorted? Im designing a capacitor and I have decided to make the surface of 1 plate of the capacitor bigger than the other plate. Image alt text How are the charges sorted through A2?Are they spread out to cover all the surface area of the conductor (A2)? (more) about 1 year ago Edit Post #286802 Initial revision about 1 year ago Question Calculate inductance using laws of electromagnetism Get 2 conductors and seperate them we can use Gauss's law to calculate the capacitance created by the seperation of the 2 conductors.Can we use other laws of electromagnetism to calculate the inductance of a piece of wire just like we used Gauss's law to calculate the capacitance of the 2 seperated c... (more) about 1 year ago Edit Post #286695 Question closed about 1 year ago Edit Post #286695 Initial revision about 1 year ago Question Meaning of complex frequency If we have a LC high pass filter the transfer function H(s) becomes: $$H(s) = \cfrac{sL}{sL + \cfrac{1}{sC}}$$ If we solve for s to find a pole of the transfer function we get: $$s = j \cfrac{1}{\sqrt{LC}}$$ In the case of a sinusoidal input signal =$ s = j \omega \rightarrow \omega ...
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Edit Post #285688 Initial revision over 1 year ago
Question Conductivity with angle of light
In the lab I changed the angle the light hits a photoresistor and it doesnt obey Lambert's cosine law the conductivity of the photoresistor drops fast from +-20 to +-30 degrees angle.Why?
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over 1 year ago
Edit Post #284165 Initial revision about 2 years ago
Answer A: Is it plausible to desire a "universal" calendar applicable everywhere in our universe?
I dont think anyone can make a universal calendar because time flows more slowly or more fast between different regions in the universe or it can even go backwards if you come close to a rotating black hole. And a planck unit of time is not the smallest amount of time ,the planck time is defined a...
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Edit Post #283743 Initial revision about 2 years ago
Question Superconductivity
In my notes from University the reason a material can exhibit superconducting properties is at really low temperatures electrons form Cooper pairs of which the electrons of the Cooper pairs have lower energy than if they were in the conduction band so which means that they dont collisions with the ca...
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Comment Post #283395 @#8056ts we should make this a new question.
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Comment Post #283395 @#8056ts we should make this a new question.
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Comment Post #283395 Olin photons can't accelerate like most of the objects because photons always move with one speed for all inertial frames.
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Comment Post #283393 But how can we find x(t) from F(r) since they have different arguments?
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Edit Post #283392 Initial revision about 2 years ago
Answer A: Why we can't find a particle accelerating unless there's some other particle accelerating somewhere else?
> But, when we are walking, running. We are accelerating. Wrong.When you are walking you're moving at a costant speed. > The third law says we will never find a particle accelerating unless there’s some other particle accelerating somewhere else The book says that because of Netwon's 3r...
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Edit Post #283386 Initial revision about 2 years ago
Question How to find position of a particle at a time given a position dependent force
If we have a force which changes depending on the position of a particle, how can we find the position of the particle at some time $t$? We can find its velocity if it has travelled a given distance $$\int^{rf}{ro} F(r)dr = \frac{1}{2} \cdot mp(uf^2 - uo^2)$$ but this equation doesn't inv...
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Edit Post #283251 Post edited:
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Comment Post #283251 I will edit the question then
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Comment Post #283251 It is an exercise the gravitational field exists only for some r below a limit and a test particle enters somehow(pops into existence) at the edge of the field.
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Comment Post #283251 It is a exercise it is not the real deal. The gravitational field only exists for some r below a limit.
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Comment Post #283009 I am assuming for simplicity the B field becomes 0 after the particle reaches the end of the wire.
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Edit Post #283259 Initial revision about 2 years ago
Answer A: Signal modeling as only digital, only analogue, or as both
If a signal has a analog component then it analog regardless of if it has a digital component.
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Comment Post #283258 I don't think this has anything to do with physics.
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Comment Post #283251 And i have something else in my mind lets just say the initial acceleration is 0.
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Comment Post #283251 HDE 226868 you are correct i will edit
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Edit Post #283251 Initial revision about 2 years ago
Question Find jerk of time varying force
This gravitational field we move inside has some distance L after which it becomes 0.Before L it is just like any gravitational field. Suppose we move inside that gravitational field.The acceleration we experience depends on the distance from the planet. $$a\sim\frac{1}{r^2}$$ At t=to we enter t...
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