The work required is given by the change in potential energy for the four charge configuration.
, where W is work and U is potential energy.
The electrostatic potential energy:
, where k is Coulomb's constant and r is the distance between two charges q1 and q2.
How much work in joules is required to set up the four-charge configuration of the figure if q = 4.10 pC, a = 74.0 cm, and the particles are initially infinitely far apart and at rest?
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