## Arrangement 1
2001B3. Four charged particles are held fixed at the corners of a square of side s . All the charges have the same magnitude Q , but two are positive and two are negative. In Arrangement 1, shown above, charges of the same sign are at opposite corners. Express your answers to parts a . and b . in terms of the given quantities and fundamental constants.
a. For Arrangement 1, determine the following.
i. The electrostatic potential at the center of the square
ii. The magnitude of the electric field at the center of the square