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  1. #1
    All Natural O_S_U's Avatar
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    Physics help (electric fields) REPS FOR LIFE

    I need this last answer for my homework, can't figure this one out.

    The figure below shows two concentric rings, of radii R and R ' = 2.90R, that lie on the same plane. Point P lies on the central z axis, at distance D = 2.10R from the center of the rings. The smaller ring has uniformly distributed charge +Q. What must be the uniformly distributed charge on the larger ring if the net electric field at point P due to the two rings is to be zero?

    answer is [________] x Q




    The answer comes from this, but this is using different numbers



    Any ideas?
    Last edited by O_S_U; 10-05-2010 at 05:01 PM.
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  2. #2
    All Natural O_S_U's Avatar
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    bump
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  3. #3
    ¯\_(ツ)_/¯ HarryBalzac's Avatar
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    E = kq/r^2 ?

    maybe set E = E1
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  5. #5
    All Natural O_S_U's Avatar
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    Originally Posted by zachstu View Post
    I'm not a member of cramster.
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  6. #6
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Originally Posted by O_S_U View Post
    I need this last answer for my homework, can't figure this one out.

    The figure below shows two concentric rings, of radii R and R ' = 2.90R, that lie on the same plane. Point P lies on the central z axis, at distance D = 2.10R from the center of the rings. The smaller ring has uniformly distributed charge +Q. What must be the uniformly distributed charge on the larger ring if the net electric field at point P due to the two rings is to be zero?

    answer is [________] x Q

    [[(2.10R)^2 +(2.9R)^2]^(3/2)] / [(2.1R)^2 +R^2)^(3/2)] times Q

    If I didn't make any mistakes... did it kinda fast.
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  7. #7
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Did it work?
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  8. #8
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    Originally Posted by Cell-Tech View Post
    Did it work?
    sorry I was away, trying it now reps either way though I'll let ya know if it works
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  9. #9
    All Natural O_S_U's Avatar
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    the answer comes from this



    They used different numbers though and didn't explain it well, anybody know how to do it from here?
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  10. #10
    Sports misc regular fly4navy117's Avatar
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    Originally Posted by O_S_U View Post
    I need this last answer for my homework, can't figure this one out.

    The figure below shows two concentric rings, of radii R and R ' = 2.90R, that lie on the same plane. Point P lies on the central z axis, at distance D = 2.10R from the center of the rings. The smaller ring has uniformly distributed charge +Q. What must be the uniformly distributed charge on the larger ring if the net electric field at point P due to the two rings is to be zero?

    answer is [________] x Q

    Possible quick answer would be to use the ratio of R:R'

    R/1Q = R'/xQ

    I'll go grab one of my old physics books to be sure. Might be forgetting something.

    edit: lemme think about that equation you posted.
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  11. #11
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Originally Posted by O_S_U View Post
    the answer comes from this



    They used different numbers though and didn't explain it well, anybody know how to do it from here?
    I used that equation. I even plugged in R as a random number to see if the field equaled to 0 and it did.

    Said it was wrong?
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  12. #12
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    Originally Posted by Cell-Tech View Post
    I used that equation. I even plugged in R as a random number to see if the field equaled to 0 and it did.

    Said it was wrong?
    What would I plug in as the answer, it doesn't recognize R i'm not sure what to put in for R is the problem lol Idk i'm kinda lost here
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  13. #13
    Dat Dere Cell-Tech Cell-Tech's Avatar
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    Originally Posted by O_S_U View Post
    What would I plug in as the answer, it doesn't recognize R i'm not sure what to put in for R is the problem lol Idk i'm kinda lost here
    IT has to be an actual number times Q?
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  14. #14
    All Natural O_S_U's Avatar
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    Originally Posted by Cell-Tech View Post
    IT has to be an actual number times Q?
    yes as you can see the number from the answer in the other one is -4.19, that's why I'm confused lol
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  15. #15
    Sports misc regular fly4navy117's Avatar
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    I bet you get an XR/R and the R term just goes to 1 and you're left with X
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  16. #16
    Sports misc regular fly4navy117's Avatar
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    Here is the screen shot of the cramster answer.

    edit: both
    Attached Images
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  17. #17
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    Originally Posted by fly4navy117 View Post
    Here is the screen shot of the cramster answer.

    edit: both
    Finally got it thanks to that ha, answer was -3.648
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