Physics please clarify

posted by .

Posted by Mary on Monday, September 3, 2007 at 12:40pm.
download mp3 free instrumental remix
A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each of the two empty corners?



For Further Reading


Physics - bobpursley, Sunday, September 2, 2007 at 11:10am
Potential is a scalar, so you can just add all four contributions.


Vt= -3q/r + 2q/r + 2X/r=0

solve for charge X

when i use the formula i can up with +1q and the system is saying that the answer is incorrect.





For Further Reading


Physics please clarify - drwls, Monday, September 3, 2007 at 1:17pm
The equation you should be solving is
2q/a -3q/a + (sqrt 2)x/a = 0

Where a is the length of a side of the square. The corners with charges are a distance "a" away from the empty corners, but the center charge x is closer.

Multiplying bith sides by a gives
-q + sqrt 2 * x = 0
x = 0.707 q



Physics please clarify - Mary, Monday, September 3, 2007 at 4:39pm
Can you please explain how you get to x=0.707q.


I got how you got up to -q+sgrt2*X=0 but i keep coming up with a different answer than 0.707q.

  • Physics please clarify -

    I misread the problem, thinking you wanted the potential zero at the center, that is why all my distances were the same.

    Here, the potential at the two corners is zero. Let s be the side length..so the diagonal length from the corner to the center is s*1/sqrt2
    0= -3q/s + +2q/s+ X/(s*1/sqrt2)

    then q/sqrt2=X the charge at each corner, or X=.707q at each corner

  • Physics please clarify -

    The answer 0.707q is correct but I am still not understanding how to get to that answer.

    I have another problem just like this one but with different values for q. When I use the formula above I am coming up with an incorrect answer. Please help. My question is:

    A charge of +1q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each of the two empty corners?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each …
  2. REPOST ABOUT ENG.

    Posted by Anonymous on Sunday, September 2, 2007 at 6:01pm. download mp3 free instrumental remix Also a continued post from yesterday: I am wondering then why it's asked this way, "BENEATHA is particularly bitter, BUT Ruth defends …
  3. Physics please clarify

    A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each …
  4. Physics please clarify

    Posted by Mary on Monday, September 3, 2007 at 12:40pm. download mp3 free instrumental remix A charge of +2q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of …
  5. Physics please clarify

    A charge of +1q is fixed to one corner of a square, while a charge of -3q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each …
  6. Physics repost

    Posted by Mary on Monday, September 3, 2007 at 7:11pm. download mp3 free instrumental remix The drawing shows four point charges. The value of q is 2.4 µC, and the distance d is 0.86 m. Find the total potential at the location P. …
  7. physics

    A charge of +4q is fixed to one corner of a square, while a charge of -9q is fixed to the opposite corner. Expressed in terms of q, what charge should be fixed to the center of the square, so the potential is zero at each of the two …
  8. Help Please!

    Charges of −4q are fixed to diagonally opposite corners of a square. A charge of + 5q is fixed to one of the remaining corners, and a charge of + 3q is fixed to the last corner. Assuming that ten electric field lines emerge from …
  9. Physics

    Identical point charges of +1.1 ¦ÌC are fixed to three of the four corners of a square. What is the magnitude q of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner …
  10. AP Physics 2

    Identical point charges of +3.3 µC are fixed to three of the four corners of a square. What is the magnitude |q| of the negative point charge that must be fixed to the fourth corner, so that the charge at the diagonally opposite corner …

More Similar Questions