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Maxwell displacement

  1. Mar 8, 2006 #1
    HI ,
    I need help for this problem:

    A parallel- plate capacitor is being charged at a rate of I=0.2A. The plates have an area of 0.25m2and are separeted by 1 cm.. What is the value of Integral(B*dl)for a closed path midway between the plates and covering an area of 5.0X 10-2m2?


    my problem here is how to find the derivative of the flux, used in the expression of the Maxwell displacement current.

    I know that the flux=E*A but then I am stuck.
    Can I have some help?

    Thank you
  2. jcsd
  3. Mar 10, 2006 #2


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    Homework Helper

    Use Gauss to find an expression for the E-field in terms of charge Q (not sigma).
    E-field is increasing due to I bringing more charge onto the plate ... I = dQ/dt.
    So, Q = Q_o + I*t . Now you have a function of time, you can take d/dt of it.
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