Physics

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Three charges (q1 = 8.7 nC, q2 = -7.2 nC, and q3 = -4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge.

  • Physics -

    q1, q2, q3 –from the lower left corner – counterclockwise.
    Origin of the coordinate system is at the corner where q1 is located.

    F12=k•q1•q2/a² =
    =9•10^9•8.7•10^-9•7.2•10^-9/9.2²•10^-4=
    = 6.74•10^-5 N
    F12x=0 F12y=6.74•10^-5 N.

    F13=k•q1•q3/D(a√2)² =
    =9•10^9•8.7•10^-9•4.8•10^-9/9.2²•10^-4•1.41=
    =3.15•10^-5 N
    F13x=F13y=3.15•10^-5•cos45=2.23•10^-5 N.

    F1x= F12x+ F13x =0+2.23•10^-5 =2.23•10^-5 N.
    F1y= F12y+ F13y= 6.74•10^-5 +2.23•10^-5 =8.97•10^-5 N.
    F1=sqrt(F1x² + F1y²) =sqrt(2.23² +8.97²)•10^-5 =9.24•10^-5 N
    The same procedure for other charges

  • Physics -

    Order, clockwise- q1, q2, q3....

    Could you explain the procedure in words?

  • Physics -

    Never mind Elena, when I wrote it out on paper it made sense. Thank you very much! :)

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