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shaqadry

  • 2 years ago

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

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  1. Mashy
    • 2 years ago
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    first tell me what is the formula to calculate electric field due to a point charge?

  2. shaqadry
    • 2 years ago
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    E=F/q=kq/r^2

  3. Mashy
    • 2 years ago
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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?

  4. shaqadry
    • 2 years ago
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    i think it has the same nature since the magnitude of electric field is high

  5. Mashy
    • 2 years ago
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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?

  6. Mashy
    • 2 years ago
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    |dw:1354890053415:dw|

  7. shaqadry
    • 2 years ago
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    i think same direction

  8. shaqadry
    • 2 years ago
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    i dont know what happens at the center :-/ the radius is halved i guess?

  9. Mashy
    • 2 years ago
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    how is that?? the direction of electric field due to a positive charge is always AWAY from the charge!!

  10. Mashy
    • 2 years ago
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    |dw:1354890336186:dw|

  11. shaqadry
    • 2 years ago
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    okay

  12. Mashy
    • 2 years ago
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    |dw:1354890474542:dw|

  13. Mashy
    • 2 years ago
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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

  14. shaqadry
    • 2 years ago
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    the net force is 0?

  15. shaqadry
    • 2 years ago
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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

  16. Mashy
    • 2 years ago
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    No now.. the net force will add up and = 45 N/C

  17. Mashy
    • 2 years ago
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    net field*

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

  19. Mashy
    • 2 years ago
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    r is .075/ 2 cause the mid point is half the distnace

  20. shaqadry
    • 2 years ago
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    i got the answer! thank you very much :)

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

  22. shaqadry
    • 2 years ago
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    i know it helps a lot! so thank you!

  23. Mashy
    • 2 years ago
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    anytime :)!

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