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Math Help - magnitude of field at center or rectangle.

  1. #1
    Senior Member
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    magnitude of field at center or rectangle.

    eletric field magnitude equation: E = F/|q0| or must i use: E k|q|/r^2 ?

    The magnitude of each of the charges in the figure is 9.10 10^-12 C.

    The lengths of the sides of the rectangle are 3.00 cm and 6.00 cm.

    Find the magnitude of the electric field at the center of the rectangle in figures a and b.

    here are the figures: http://img260.imageshack.us/img260/5163/37111607os9.png

    need help please.
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  2. #2
    Junior Member Pinsky's Avatar
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    Rijeka
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    I think you should use the second one.
    The constant k is \frac{1}{4\pi\varepsilon}
    I suppose you know the value of k. The only reason you can use E=k\frac{q}{r^2} is because th charges are of the same value.
    You get r by pitagoras theorem. You put all four vectors in point c and write them analiticaly.

    E_2=E\angle arctg\frac{3}{1.5}

    What you have to do here is calculate the vectors then. I'm kind of in a hurry right now, i'll try to solve it in the afternoon, with pictures and everything. Hope you can wait till then.
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