if we move a charge from infinity to some point....then no work is required because no electrostatic force due to any other charge opposes it... then... how the charge can be moved from infinity to some point?
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Explanation:
Electric potential (V) at a point is defined as the work done (U) required to bring a charge (q) from infinity to that point divided by the charge: V = U/q. With this definition, V = 0 at infinity. Important: electric potential is a scalar.
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