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Physics : Recent Questions and Answers (Page 264)

Find answers to your questions about Physics or help others by answering their Physics questions.

Why does a resistor that isn't connected to anything in one of its terminals has a null current?

For example, in the following circuit: The $2Omega$ resistor is "floating" since it's not connected to anything in its right terminal. Hence,...

Asked on 06/13/2021 by racc_p

2 answer

Angular Frequency of a charged particle moving in a Magnetic Field

I am trying to solve the Differential Equation in Mathematica but it is giving me error. How to find it's solution in Mathematica or in general. $$y'''=frac{omega^2E}{B}-omega^2y'$$ The above...

Asked on 06/13/2021

1 answer

EM-wave equation in conductors with source terms

The traditional modified Maxwell's equations to express em wave inside conductors that I have come across are: $$nablacdotmathbf E = 0nablacdotmathbf B = 0nablatimesmathbf E =...

Asked on 06/13/2021

1 answer

Can we use curved spacetime to measure the one-way speed of light?

This is related to Measuring one-way speed of light with gravitational lensing and Measuring the one-way speed of light with a black hole? The idea is to shine...

Asked on 06/13/2021 by Whynaut

1 answer

Electric field due to a charged conductor

I have this grave confusion that I have been having since a while.When we calculate the electric field due to an infinite plane sheet of charge then the answer...

Asked on 06/13/2021 by Karan Singh

2 answer

If $xi_mu$ is a Killing vector is it true that its contravariant representation $xi^mu$ also is a Killing vector?

QuestionI have worked on an exercise and proved that$$nabla_{mu} xi_{nu}+nabla_{nu} xi_{mu}=0$$ i.e. that $xi_mu$ is a Killing vector. Now I wonder if it therefore...

Asked on 06/13/2021 by Mattias Johnson

2 answer

Half sphere in waveguide

So, the cutoff freq, $f_c$ of a rectangular waveguide is following: $$f_{c}=frac{1}{2pisqrt{mu epsilon }}sqrt{(frac{pi}{a})^{2}}.$$ For TE10 mode, the equation is a little weird as I am dropping some...

Asked on 06/13/2021 by Chtholly

1 answer

Why enthalpy increases when we heat a gas at constant volume

I have read many answers on stack exchange about what is the physical meaning of enthalpy, and there are some wonderful explanations. one analogy i find very satisfying is it...

Asked on 06/13/2021

2 answer

Series Combination of Spring

I'm a little confused with this high-school mechanics question. Where you have two spring with different spring constants, say $k_1$ and $k_2$, we joint them together and of...

Asked on 06/13/2021

3 answer

Rate of direct (non-thermal) photon-induced evaporation of water?

I have read a long time ago of early experiments in the evaporation rate of surface water, and a discovery that in addition to the Sun's impact on the temperature...

Asked on 06/13/2021

0 answer

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