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July 30, 2014

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Posted by **Mary** on Monday, September 3, 2007 at 12:40pm.

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.

- Physics please clarify -
**drwls**, Monday, September 3, 2007 at 1:17pmThe 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 4:39pmCan 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 -
**stork**, Thursday, January 22, 2009 at 10:27pmsolve the equation on paper to make it clear. you will end up doing -1/-(sqrt 2)

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