00:01
So today, we're told that we have a rectangle with sides of 14 centimeters and 7 centimeters.
00:07
And we're told that we have three charges in the corner of the rectangle.
00:12
Our charge 1 is 4 .9 microcalooms.
00:15
Our second charge is negative 4 .9 microclooms, and our third charge is 2 .5 microcalooms.
00:21
And we're asked to find the electric potential at the center of the rectangle.
00:25
Okay? and so what we can do is we can use the equation where the electrical.
00:30
Electric potential is equal to the kulume constant multiplied by the first charge, q1, over the distance from the charge to the center of the rectangle, r1.
00:45
And this is repeated with q2 and r2 and q3 and r3.
00:53
Okay? and since the rectangle is symmetrical, we can find the distances of r1, r2, and r3, using the pythagorean theorem.
01:03
Okay? and so, this means that r1 is equal to the square root of side a, so 14 centimeters squared, plus side b, seven centimeters squared.
01:23
However, this is a triangle, so, and we're given a rectangle, so these values have to be divided by two, and we get a point, um, 0 .06 centimeters.
01:35
And because this is the same formula for r2 and r3, we know that the answer is the same, 8 .06 centimeters...