electromagnetic

  1. A

    Electromagnetic induction question

    Very long (theoretically infinitely long) cylinder of antiferromagnetic material with radius a is uniformly charged by its volume with charge of volume density ρ. The cross-section of a cylinder is shown on an image. Cylinder rotates around its axis with constant angular velocity ω...
  2. I

    Is Halls effect electromagnetic Induction?

    Need to explain if halls effect is or isnt electromagnetic induction.I think the answer is no but I'm not sure why.They both react when a magnetic field is present,it sounds similar.
  3. N

    Effect of electric potentials on electromagnetic waves

    What happens to an electromagnetic wave when it is radiated on an object with an electric potential? Namely, what does that electric potential do to the electromagnetic wave? Context: there is a stream of electromagnetic waves being radiated on the object. The object has varying electric...
  4. timemachine2

    Are there any electromagnetic waves that traverse solid matter, while the photos also

    Are there any electromagnetic waves that traverse solid matter, while the photos also get absorbed by electrons. Is there a slight absortion? .... by some of the photons, when they hit the electrons in the atom, as they pass through say a solid piece of matter. So with all the waves in the...
  5. N

    By mixing 3 types of invisible electromagnetic waves, as they pass through a solid ob

    -ject, could the waves raise the electron to a shell level that is the same as glass, so that light cannot be absorbed, to make the object translucent, or transparent. Is it possible for any invisible EM waves, like radio waves, ultraviolet soft, or hard X- Rays, or gamma rays, to be combined...
  6. G

    Electromagnetic induction and magnet shapes. Help !

    Hello. Can someone explain to me how different magnets have a different effect on electromagnetic induction? When you use a normal flat straight magnet the side(polarity) you put it in through a coil, makes the arrow of the Galvanometer move left or right. But if you use a horseshoe magnet it...
  7. A

    Electromagnetic wave propagating in a metal

    Hi. I've been having trouble with this question for a few days. The question is as follows; "Consider a plane electromagnetic wave with angular frequency ω propagating in a large good metal with electric conductivity s (assume that sigma/omega*epsilon_0 ≫ 1), the wave electric field may be...
  8. M

    Help about energy conservation in electromagnetic induction

    .....I want to tell how I think about it...PLEASE TELL ME IF MY THOUGHT IS CORRECT.The electrical energy delivered to the coil is stored in the magnetic field of the coil.Through electromagnetic induction this energy transfer to the ring that appears as electrical energy.The reading of...
  9. M

    Electro-Magnetic Cavitation

    Fact from books James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects. Radiation pressure in classical electromagnetism: ... it was published by James Clerk Maxwell in...
  10. M

    Electromagnetic Winter Summer

    """"topsquark Super Moderator topsquark's Avatar Radiation pressure and "lag time" in the gravitational field (what you are talking about when you are concerned with an event happening at a distance away) are both well known features in Physics. There is nothing new here. If you have a...
  11. M

    Electro-Magnetic Winter Summer

    James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects. Radiation pressure in classical electromagnetism: ... it was published by James Clerk Maxwell in 1862 ,and proven...
  12. P

    attenuation of electromagnetic wave in metal problem

    The conductivity of a metal is 3.2×10^7 (Ωm)^-1 .Find the attenuation of an electromagnetic wave of frequency 2khz by a metal plate of thickness 0.1mm. I found the skin depth using δ=(2/μωσ)^(1/2) = 1.989×10^-3 m Then 1/α= δ .so α = 502.65 m^-1 is the attenuation coefficient. But the...
  13. J

    Electromagnetic Energy

    I have a good understanding of electrical potential involving relative motion of a conductor and a magnetic field, but what I'm curious about is there any potential created by pressure? I know it takes energy (force) to move the conductor through a magnetic field which creates electrical...
  14. E

    Cosmic rays: electromagnetic radiation or particles?

    Hi: In a physics textbook from 1968, a picture representing the electromagnetic spectrum, is divided into several regions: power transmission, AM radio, ..., X rays, gamma rays, cosmic rays, and the figure says: "The electromagnetic spectrum: ....... The scale ends in the vicinity of the...
  15. muon321

    Photons And Electromagnetic Waves

    How many photons correspond to a single electromagnetic wave? Is there more than one photon for each wave?
  16. D

    Energy And Electromagnetic Radiation

    3. How does each of the following relate to the amount of energy carried by electromagnetic radiation? a. Wavelength b. Frequency c. Velocity This is one of those questions in my physics assessment that the whole class is kind of wondering what to do. So far what I've found is...
  17. T

    Electromagnetic waves

    So the oscillating electric and magnetic fields are directed perpendicular to the direction of propagation of the wave. In a laser beam all these waves will be in phase, right? My question is 'Can these fields be detected in a direction perpendicular to that of the beam?' If so, and you know...
  18. S

    Electromagnetic pumps

    "Electromagnetic pumping is a non-invasive method of moving liquid used in situations where the moving parts of traditional pump are not practical. Pumping liquid metal is an example. Electromagnetic pumping involves applying an electric field and a magnetic field at the same time...
  19. A

    Electromagnetic wave

    Hey guys. I have the following problem http://img37.imageshack.us/img37/2663/81436497.png I was thinking of using the Helmholtz equation for the electric field. the thing is, can I presume that the expansion direction of the wave is the z direction? If not, the equation is pretty complex...
  20. A

    Inhomogeneous electromagnetic wave equation

    Hey guys. I'm trying to get to the inhomogeneous electromagnetic wave equation for the magnetic field, this is what I've done so far http://img175.imageshack.us/img175/1797/tmp001.jpg My problem is that I don't know how to express the expression I marked in red with the magnetic field so I'm...