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Finding magnetic field of this wire
I was trying to solve this problem and even I have solution I don't like it. So maybe you guys can share different approaches or (integration tricks)? My solution (wrong): Define angle θ between unit...
View Articleeffect of dielectric on charges
What happens To the force between 2 charges if a metal sheet or a dielectric sheet is kept in between the two charges ..(the charges are in vacuum)
View ArticleQuestion about Wave formula
I was wondering where the derivation of the formula Group Velocity = Phase Velocity + K(dVp/dK)
View Articleresistivity anti-helmholtz configuration
If I have a pair of coils connected in an anti-helmholtz configuration, with current flowing oppositely in both, and I wanted to calculate the resistivity- wouldnt the length of both coils just be...
View ArticleThis thermodynamic quantity equals what?
I am trying to use thermodynamics manipulations in order to find [itex]\partial[/itex]P/[itex]\partial[/itex]V (at constant entropy) I tried replacing P by...
View ArticleAP Question Torque Sign Conventions
On the 2012 AP Physics C Mechanics test, I got confused by the sign conventions for torques on question 3. (http://apcentral.collegeboard.com/ap...physics_cm.pdf) In the scoring guidelines,...
View ArticleNewton's 2nd law for open mass systems
Sorry, but this will be a long post. This isn't homework, I'm reviewing physics after many years of neglect. Halliday & Resnick, 4th Ed., section on variable mass and rockets, refers the interested...
View ArticleCan we produce a white laser from a visible light spectrum?
I am doing a final year project, my Prof gave me 2 prism. He wants me to do so: A white laser is shot on a prism producing a visible light spectrum, use another prism to converge the spectrum back into...
View ArticleIdeal 1/4 mile time from Average Power
I'm wanting to get the time it would take a vehicle to travel a 1/4 mile coming out of a corner in the ideal world. By ideal I mean that I'm assuming there is no energy loss to friction, wheel...
View ArticleE-M Dilemma Needs Resolution
Consider a solenoid of length l, no. of turns N, n = N/l, area A, and negligible resistance. In its middle is placed a single-turn loop of same area (well, slightly smaller) in the solenoid's middle....
View ArticleException to Ampere-Maxwell circuital law
Is it possible for a magnetostatic field to exhibit vector circulation when no current ( free, bound or polarization ) and no time variant electric fields traverse the area defined by the closed line...
View ArticleIf you stop cooling a resistor and stop current simultaneously?
If you stop cooling a resistor and stop current simultaneously then what happens to the temperature of the resistor in the next few moments? My question is actually about whether a computer CPU will...
View ArticleConstant pressure or isobaric expansion of gas
It is said that in an isobaric expansion of a gas pressure remains constant throughout the expansion process. Suppose we have a quantity of gas at initial pressure P1 and volume V2 in a piston cylinder...
View ArticleDuality quantities in electromagnetism and use of magnetic sources
Hello :smile:! Duality in electromagnetism is possible in the following way. Let [itex]\mathbf{E}, \mathbf{H}[/itex] be a field which by hypohtesis is a solution of the source-free Maxwell's equations...
View ArticleExtensive & intensive parmeters of TS
As I understand it, The intensity and extensive thermodynamic system parameters can only be internal parameters. The internal energy is an extensive parameter. Caloric equation of state of matter...
View ArticleCalculating the angle using angular acceleration
Hi I have calculated angular acceleration which changes with time. I also have a moment(torque) which also changes with time and a fixed moment of inertia. Is there an equation or a way for me to work...
View Articlenavier-stokes derivation question
hey pf! so i have a small question when deriving the navier-stokes equations from newton's 2nd law. specifically, newton states that $$\Sigma \vec{F} = m \vec{a} = m \frac{d \vec{v}}{dt}$$ when setting...
View ArticleAerodynamics of a concrete glider vs a brick (MythBusters)
I have just watched a MythBusters episode investigating whether a concrete glider could fly. They conclude that it was plausible on the basis of a model concrete glider 'flying' 34 feet while dropping...
View ArticleThe original definitions
What's the original definition of Ohm, ampere, volt and coulomb, And which unit was defined according to the other ??!
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