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Math Help - Computing total attractive force by integrating over the surface of the shell S.

  1. #1
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    Computing total attractive force by integrating over the surface of the shell S.

    It would be really appreciate if someone can explain what to do on this question.

    Thank you.
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  2. #2
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    Re: Computing total attractive force by integrating over the surface of the shell S.

    I would first calculate the force due to a small "ring" of the spherical shell - it is a constant distance from the point mass at (0,0,b). Then integrate to get the total force.

    I won't ruin the ending for you, except to say that you'll be surprised at what the force *doesn't* depend on.

    - Hollywood
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