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  1. patrykh18

    Numerically simulating stellar pulsation using a "one zone" model

    The question is taken from An Introduction to Modern Astrophysics by Carroll and Ostlie. I did manage to do the entire question and plot the relevant graphs but I just wanna to investigate a bit more. For example I wanna look at how the graph would like in the case of the Sun. I don't know what...
  2. patrykh18

    Stress tensor for a parallel plate capacitor

    Ah okay, so all the momentum will go straight into the plates. I think I understand now. Thanks a million.
  3. patrykh18

    Stress tensor for a parallel plate capacitor

    Okay that is starting to make more sense now. Just need to clarify a few small things. There is no magnetic field in the question. Therefore the Poynting vector is zero everywhere. So the volume integral of our Poynting vector will be zero. Therefore the electromagnetic momentum at any point in...
  4. patrykh18

    Stress tensor for a parallel plate capacitor

    Region II is gaining z-component of momentum and region I is losing z-component of momentum
  5. patrykh18

    Stress tensor for a parallel plate capacitor

    So I read the chapter more carefully and I'll try these again (a) The quantity ##\left(-T_{zz} \right)##: given a surface (in this case x-y plane) oriented in z direction, the z component of momentum flowing through the region (b) -##\sigma^2/2\epsilon## (c) The quantity ##\left(-T_{zz}...
  6. patrykh18

    Stress tensor for a parallel plate capacitor

    That would be the z component of the electromagnetic momentum to be more precise. I think if the quantity ##\left(-T_{zz}\right)## is positive the direction would be downward.
  7. patrykh18

    Stress tensor for a parallel plate capacitor

    (A) That's the electromagnetic momentum flowing through that point in the xy plane (B) You could use the relationship between force and electric field i.e. force per area is the electric field times charge density (C) It is positive (D) In the same direction as (C) (E) The region above xy plane...
  8. patrykh18

    Stress tensor for a parallel plate capacitor

    The question is partially taken from Griffith's book. I am confused about the physical meaning of momentum in fields. I have determined the solution and found that in part d the momentum crossing the x-y plane is some value in the positive z direction. I don't however understand the physical...
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