Recent content by jajay504

  1. J

    Circular ring in xy-plane with current, find current density

    Homework Statement Consider a circular ring of wire of radius a that resides in the x-y plane through the origin. The center of the ring coincides with the origin and you can regard the thickness of the wire to be infinitesimal. a. Given that a current I flows in the ring, find an...
  2. J

    E&M: Find relationship of the constants for a given magnetic field

    Homework Statement Given the magnetic field B= α*x*y x^ + β*y^2 y^. What is the relationship between α and β. Find the current density J. Homework Equations I know that the relevant equations are Δ dot B = 0, Δ x B = μJ, Δ dot A = 0, Δ x A = B The Attempt at a Solution I know...
  3. J

    Tough Concentric Spheres with mixed Dielectrics and a air-gap Problem

    1. Homework Statement 1. Homework Statement I have concentric spheres with mixed dielectrics. There is an air-gap between the spheres which consist of a permittivity ε0. The radius' are a, b and c and the permittivities of the dielectric portions are ε1 and ε2. An image is attached! What...
  4. J

    Tough Concentric Spheres with mixed Dielectrics and a air-gap Problem

    Homework Statement I have concentric spheres with mixed dielectrics. There is an air-gap between the spheres which consist of a permittivity ε0. The radius' are a, b and c and the permittivities of the dielectric portions are ε1 and ε2. An image is attached! What are the potentials in the 4...
  5. J

    Integral form of Gauss' Law, Parallel Plate Capacitor

    Homework Statement If one were to consider a parallel plate capacitor with a distance d between them connected to a battery and a vacuum space between the plates. Will the integral form of Gauss' Law to any closed surface between the plates that does not cross either plate hold? If not, what...
  6. J

    Find the flux through a surface S (Electromagnetic Theory)

    Sorry for that. This one. I think I may have over thought it a bit.
  7. J

    Find the flux through a surface S (Electromagnetic Theory)

    Flux= EA cos(theta)= E.A I got flux = q/4e0 I don't have experience using mathematica at all
  8. J

    Electric Fields, Flux, Gauss' Law

    Sorry for that! I put down the work I had
  9. J

    Electric Fields, Flux, Gauss' Law

    Hey! Sorry for that... I did some work but I got stuck. I used divergence E = p/e0 a.) div E = (-a/r^2 - 2/r^3) * exp(-a*r) = p/e0. So I know what p is. b.) Then I tried to integrate over p(rho) to get q_tot q_tot = Integral [pdV] I got --> exp(-a*r)/r^2 - 2*exp(-a*r)/r^3 = q_tot...
  10. J

    Electric Fields, Flux, Gauss' Law

    Homework Statement The Electric field E produced by an unknown charge distribution p (rho) is E(r)= (constant)*((exp(-ar))/r^2)*(r_hat). a.) Use Gauss' law in differential for to determine p(rho) b.) Find the total charge q_tot by directly integrating p(rho), and show that it is 0. c.)...
  11. J

    Find the flux through a surface S (Electromagnetic Theory)

    Homework Statement A point charge q1 is located on the y-axis at r1= a (Y_hat) and another q2 located at the mirror point r2= -a (Y_hat). The charges are not necessarily the same sign or magnitude. Now consider the circular surface S of radius a contained in the x-z plane through the origin...
  12. J

    Understanding Electric Dipole Transitions: Problem #2

    Homework Statement Attached PDF. Problem # 2. Homework Equations Used parity selection rule, Assumed Russell-Saunders Coupling The Attempt at a Solution I only understand the electric dipole allowed transitions from reading. I don't actually understand how they work. For the...
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