Deduce an expression for the potential energy of a system of two point charges q1 and q2 located at position r1 and r2 respectively in an external field (E)
Work done to bring q1 from infinity to r1 = q1v(r1)
Work done to bring q2 from infinity to r2 = q2v(r2)
Also, work done on q2 to move it against the field due to
Where,
distance between q1 and q2
. . potential energy of the system
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