Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [electromagnetism]

For questions on Classical Electromagnetism from a mathematical standpoint. This tag should not be the sole tag on a question.

For questions on Classical Electromagnetism from a mathematical standpoint. This tag should not be the sole tag on a question. Examples of other tags that might accompany this include (algebra-precalculus), (vector-analysis), and (fourier-analysis).

396 questions
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Electric field with Maxwell's 1st equation

With a total charge Q within a radius R the problem is to find the electric field at a radius r>R and r
hanban
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Consider a wire of length $L$ with linear charge density $\lambda$.

I am a new student, I know the concepts of electric field and it is difficult for me to solve this exercise. Could you help me with this exercise? Consider a wire of length $L$ with linear charge density $\lambda$. Calculate the electric field at…
Astrid
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Cycloid motion of charged particle in electromagnetic field

The question is from Schaum's Theoretical Mechanics. The electric field is given by $\underline E=E\hat k$ The magnetic field is given by $\underline B=-B\hat j$ Prove that the motion of a charged particle of charge $q$ and mass $m$ that starts…
Amrit Cassim
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Using Right-Hand Rule for a Current Running in a Loop

Hello. Using the right hand rule, shouldn't the magnetic force be going into the paper, since velocity is to the left and the force caused by centripetal acceleration is downward? The answer key says that the answer is C. How is it not D?
K. King
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Infinite straight wires Vector potential

I have this question to write down the vector potentials for four straight wires parallel to the $z$-axis cross the $xy$-plane at the vertices of a square: $(a, a), (a, −a), (−a, a)$ and $(−a, −a)$. The wires through points $(a, a)$ and $(−a,…
dahaka5
  • 275
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Electric field by a surface

I have tried to demonstrate the classic result that afirms that the electric field in a charged surface is proportional to the surface densitity in each point. In the books I read they assume, when using Gauss theorem with a cylinder, that the field…
Carlos
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Electrostatic potential for a system of of charges

I have been given this question and would just like some hints for how to get started. A system of charges consists of +2q at the origin and -q at the two points $(0, 0, a) $ and $(0, 0, -a)$. Show that the potential is given by: $\phi(r, \theta)…
dahaka5
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Electric Field Integral

In the example shown below, I need to know how dy(the numerator portion of the integral) gets converted into x sec²θdθ. Problem Integral
R SMITH
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Magnetic field and taylor series

I'm really confused about this, I have the magnetic field generated by a current in a disk. $$B=\frac{\mu \sigma \omega}{2}\left(\frac{\sqrt{R^2+Z^2}}{Z}+\frac{Z}{\sqrt{R^2+Z^2}}-2\right)$$ So I was asked to see what happens when Z is really big. I…
Andrea Mora
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