deduce expression for elastic potential and isolated change
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Consider the electric potential due to a point charge q, As we move from point A, at distance rA from the charge q, to point B, at distance rB from the charge q, the change in electric potential is
ΔV
BA
=V
B
−V
A
=−∫
A
B
E.ds
E.ds=[k
r
2
q
]
r
^
.ds
r
^
.ds=dr
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