Posted by **sara** on Wednesday, March 4, 2009 at 10:32pm.

Identical +7.74 C charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total potential at the remaining empty corner is 0 V?

I thought that this is what i should do. But I cant get the correct answer...

the total potential is

V = k[7.74C/r + 7.74C/2 *r + q/r]

0 = k/a[(7.74C+q)2 + 7.74C]

or (7.74C+q)2 = - 7.74C

q = -7.74C[1+1/2]

So that gives me q=-13.23. I am told that that is the wrong answer. Please help!

## Answer this Question

## Related Questions

Physics - Identical +3.92 C charges are fixed to adjacent corners of a square. ...

Physics - Identical +6.15 C charges are fixed to adjacent corners of a square. ...

physics - Identical +1.39 C charges are fixed to adjacent corners of a square. ...

physics - Identical +3.07 C charges are fixed to adjacent corners of a square. ...

physics - Identical +1.45 C charges are fixed to adjacent corners of a square. ...

physics - Identical +7.74 μC charges are fixed to adjacent corners of a ...

Physics - Identical point charges of +2.1 C are fixed to diagonally opposite ...

Physics - Identical point charges of +2.1 C are fixed to diagonally opposite ...

physics - A positive point charge and a negative point charge have equal ...

Physics - idential point charges of 1.7e-6 C are fixed diagonally on opposite ...