Derive the expression for potential energy of a system of two charges in the
absence of the external electric field.
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Answer: Consider a system of two point charges
Q1 and Q2 and separated by a distance r.
The work done to move Q1 from infinity to
a =W1 = 0
The work done to move Q2 from infinity to
b = W2 = 0
There is no initial electric field
The potential energy of this system of charges is equal to the work done
to build this configuration
U = W1 + W2 = 0
Explanation:
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