Work done by electric field
Suppose there are two parallel plates with charges of opposite polarity on the faces towards each other (a charged capacitor, disconnected) and we send a charged particle through the field between them...
View ArticleElectromagnetism: What are free and bound charges? Why are H and D defined...
My teacher's notes don't explain this. What are free and bound charges, and why are the H and D field defined like they are?
View ArticleElectrodynamic Tether experiement
I was reading about the electrodynamic tether experiments in low earth orbits to generate electricity. I had a doubt regarding the mathematics that went behind calculating the emf across the tether. I...
View ArticleHow would I solve this problem?
If I throw an object of mass m with a velocity v against another object of mass M and is stationary, how far would the second object move? Can you please show me how I would solve this? Just show me...
View ArticleEffective Refractive Index - Should be simple
Imagine a dielectric made of of alternating layers of widths A and B and refractive indices (a*) and (b*). Find the effective refractive index, N So in general: c/n = wavelength x frequency = phase...
View ArticleWhat does the integration of a distance-time graph?
...yield? Would it be useful for anything? I understand that it would yield measurements in ms (meter-seconds). Is there a term for it?
View ArticleNewton's Law of motion
Hi, Newton's 2nd Law can study the motion of the objects in the case of zero net force: F = ma if F = 0 then a = 0 then v = constant, then the object is either at rest (v=0) or moving in uniform...
View ArticleNeed a demonstration of constant motion and balanced forces
I'm a high school physics teacher and I need a way to demonstrate net force = zero when something is moving at a constant speed. Usually some get it right away, some don't care and a few just really...
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Integrating F.dx
I'm sure this is an easy question to answer - per the attached image, can someone please explain why the friction force has not required/been affected by integration? My calculus is very rusty but the...
View ArticleImpact Speed vs Terminal Velocity
What's the difference between impact speed and terminal velocity? I'm reading a book that gives a shortcut about how to calculate "The speed at impact in the y-direction when falling from rest" and it...
View ArticleWhy do we take convective derivative in fluid dynamics
I am studying plasma physics. While treating the plasma as a fluid, we replace the generla time derivative of velocity of any particle by the convective derivative. I would like to know the reason and...
View ArticleWhat is a fluid element in fluid dynamics
What do you mean by a fluid element? What is its velocity? What is your frame of reference while dealing with fluid mechanical problems?
View ArticlePermitivity electric field relation
Hi, D=εE, and E=Q/(4πεr^2). We may suppose generally that, E is inverse proportional to permittivity. Combining the interpretation to the first equation, E is dependent variable, and D is the...
View Article2 explanations for normal force
I have heard 2 informal explanations for the normal force during a situation like a book resting on a table: 1. The springiness of the atomic lattice in the table attempts to restore its original...
View ArticleIsobaric processes
Hello.I'm studying thermodynamics and i'm having trouble understanding processes where the pressure is constant.How can temperature alone modify the volume without doing pressure.An example would be...
View ArticleDerivation of Maxwell's relations
In thermodynamics one of the maxwell relations is: [itex] \left( \frac{\partial S}{\partial V} \right)_T = \left( \frac{\partial P}{\partial T} \right)_V [/itex] When I try to derive it from [itex] dU...
View ArticleWhich one has the greater deceleration
I'm just wandering. Because I have a debate with my classmate. Which one has the greater deceleration a bicycle with an acceleration of 0.5 meters per second or a car with 0.83 meters per second. I...
View ArticleBremsstrahlung X rays
1. I have problems finding the truth of this statement. The statement is cited from "book". I want to draw your attention to the following words: electron is decelerated 2. Statement: "Bremsstrahlung X...
View ArticleHolographic grating - can we calculate efficiency for each order?
Hi, I'm new to working with gratings. From using the basic grating eqn., I'm able to model the diffraction angles for each order with different angles of incidence upon the grating and I can calculate...
View Articleenergy is scalar or vector ?
Someones like teachers in my country says energy is vector and scalar . Is that true ? Anyone can prov that ?
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