The drawing shows a square, each side of which has a length of L = 0.250 m. Two

Question

The drawing shows a square, each side of which has a length of L = 0.250 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -5.00 x 10-9 C placed at corner A and then at corner B.

The drawing shows a square, each side of which has a length of L = 0.250 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -5.00 times 10-9 C placed at corner A and then at corner B.

Explanation / Answer

The potential energy of the system is

U = k * {q1*q2/ a12 + q1q3/a13 + q2q3/a23]

a12 is the distance between q1 and q2 .
a13 is the distance between q1 and q3 and
a23 is the distance between q2 and q3
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In the given problem
In the first configuration
U = k * {q1*q2/ a12 + q1q3/a13 + q2q3/a23]
U = 9e9 *(1.e-9)

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