What is the meaning of infinity in potential difference???

Dear student,
infinite is considered as reference point in case of electrostatics. It is more like an imaginary point where the net charge =0, so the potential at infinite is zero. The concept of infinite is used to define work done , when a unit positive charge is moved from infinite to a specific point.
as we know,
(work done) /charge = (potential difference) 
Wq=Vb-Vawhere Va=potential at infinite =0and Vb = potential at any specific point
Basically, as the potential at infinite is zero, we can directly get the potential of a specific point from this equation.
so, infinity is considered as a reference place that is fixed

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Dear Student,

For electric situations, we choose infinity as the reference point where the electric potential energy or the electric potential is zero.

Daivik Lakshmipathy.
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Kindly see your answer

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So how can we define the infinity in context of PD
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Actually, Infinity means time withou end
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*without end
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