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    Electric field boundary equation implication at air/earth interface

    I have a question concerning the electric field of a rotating linear dielectric disk (with angular velocity w) and a static B-field that is directed parallel to its normal (it is in the z-direction if we use cylindrical coordinates). Basically, how do I obtain the electric field. I...
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    Double Pendulum Generalized Coordinates

    The picture for the double pendulum I am referring to is pretty standard, wikipedia for example uses it and so does any other text book. I do not completely understand why one uses the second angle measured from the vertical y-axis for the second generalized coordinate. The second angle is not...