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shaqadry Group Title

Two point charges of equal magnitude are 7.5 cm apart. At the midpoint of the line connecting them, their combined electric field has magnitude of 45 N/C. Find the magnitude of the charges. Pls show me the complete calculation

  • one year ago
  • one year ago

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  1. Mashy Group Title
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    first tell me what is the formula to calculate electric field due to a point charge?

    • one year ago
  2. shaqadry Group Title
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    E=F/q=kq/r^2

    • one year ago
  3. Mashy Group Title
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    ok.. good.. tell me.. do you think the charges should be of same nature or opposite nature?? or both possible? doesn't matter?

    • one year ago
  4. shaqadry Group Title
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    i think it has the same nature since the magnitude of electric field is high

    • one year ago
  5. Mashy Group Title
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    ok.. if the charges are of same nature.. then think the direction of the electric field due to each charge at the mid point? will they be same direction or opposite direction?

    • one year ago
  6. Mashy Group Title
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    |dw:1354890053415:dw|

    • one year ago
  7. shaqadry Group Title
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    i think same direction

    • one year ago
  8. shaqadry Group Title
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    i dont know what happens at the center :-/ the radius is halved i guess?

    • one year ago
  9. Mashy Group Title
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    how is that?? the direction of electric field due to a positive charge is always AWAY from the charge!!

    • one year ago
  10. Mashy Group Title
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    |dw:1354890336186:dw|

    • one year ago
  11. shaqadry Group Title
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    okay

    • one year ago
  12. Mashy Group Title
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    |dw:1354890474542:dw|

    • one year ago
  13. Mashy Group Title
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    now.. Ea + Eb = the required answer.. !!... Ea you can find.. Eb you can find.. add them equate to required answer.. get Q

    • one year ago
  14. shaqadry Group Title
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    the net force is 0?

    • one year ago
  15. shaqadry Group Title
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    i did try that but i cant seem to get the correct anwers. the answer is 3.5 x 10^-12

    • one year ago
  16. Mashy Group Title
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    No now.. the net force will add up and = 45 N/C

    • one year ago
  17. Mashy Group Title
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    net field*

    • one year ago
  18. Mashy Group Title
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    \[2Q/4\pi \epsilon r ^{2}= 45\]

    • one year ago
  19. Mashy Group Title
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    r is .075/ 2 cause the mid point is half the distnace

    • one year ago
  20. shaqadry Group Title
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    i got the answer! thank you very much :)

    • one year ago
  21. Mashy Group Title
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    your welcome!.. i could have given the answer before.. but i wanted you to think and get it :P

    • one year ago
  22. shaqadry Group Title
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    i know it helps a lot! so thank you!

    • one year ago
  23. Mashy Group Title
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    anytime :)!

    • one year ago
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