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elica85

the potential as a function of position x is shown in the graph...

  • 2 years ago
  • 2 years ago

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  1. elica85
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    |dw:1332350001701:dw|

    • 2 years ago
  2. elica85
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    i tried to draw a smooth curve

    • 2 years ago
  3. elica85
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    is the electric field zero at x=0? is the max magnitude at 15 or 5cm?

    • 2 years ago
  4. ash2326
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    Electric Field is defined as \[E=-\frac{dv}{dx}\] v= potential so E is the negative of the slope of the potential curve. Do note that E found from this relation is the E in x - direction. At x=0 the curve is parallel to x -axis, that is it's constant so E=0 At x=5 the slope is negative and magnitude wise the highest. So E will be max at x=5 cm

    • 2 years ago
  5. elica85
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    how do you determine that the curve is parallel to x axis @ x=0? it doesn't look like it on my graph but in the actual graph, it looks parallel at x=10 too

    • 2 years ago
  6. elica85
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    i assumed E was zero at x=0 since d(v=0) should be zero so E=(d0)/dx=0

    • 2 years ago
  7. ash2326
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    No if v=0 doesn't mean that E=0 but the negative of slope of V is E, Yeah at x=10 also the slope is zero. So there also E is zero

    • 2 years ago
  8. elica85
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    hmm still confused. i need the negative of the slope of V to find where E is zero? or to find the max magnitude? and which direction is the E at the max point?

    • 2 years ago
  9. elica85
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    |dw:1332352015313:dw| is this what the graph of E look like?

    • 2 years ago
  10. ash2326
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    Ok Elica, Yeah Electric field is the negative of the voltage's slope. When we have Voltage constant or parallel to axis. Then it's slope is zero and consequently E is zero

    • 2 years ago
  11. elica85
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    ok i understand. so is the graph i did for E right?

    • 2 years ago
  12. ash2326
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    If V is cos then E will be sine

    • 2 years ago
  13. ash2326
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    x=0, v=constant so E will be zero

    • 2 years ago
  14. elica85
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    ok so it's not right. how do i determine the direction of E at x=0 or x=10?

    • 2 years ago
  15. ash2326
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    |dw:1332352349621:dw|

    • 2 years ago
  16. ash2326
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    E is in the x direction always:)

    • 2 years ago
  17. elica85
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    so right either way

    • 2 years ago
  18. ash2326
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    Yeah, when E is negative that means it's in -x direction

    • 2 years ago
  19. elica85
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    thank you so much

    • 2 years ago
  20. ash2326
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    Welcome, Did you understand?

    • 2 years ago
  21. elica85
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    yes, that was great help

    • 2 years ago
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