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GlobalDuty
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Homework Statement
Four identical point charges (+4.0 mC) are placed at the
corners of a square which has 20-cm sides. How much work is required to
assemble this charge arrangement starting with each of the charges a very large
distance from any of the other charges?
The Attempt at a Solution
I want to know if this is the right formula and answer:
U=K(q1q2/r12 + q1q3/r13 + q1q4/r14 + q2q3/r23 + q2q4/r24 + q3q4/r34)
i got 3.9 as the answer.