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Write the expression for coloumb's law

define electrostatic potential
how can we measure the potential difference across a the needs of conductor
how does the resistance of a wire vary with its cross-sectional area




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Coulomb's law expression F = km1m2/ square of distance
Electric potential is defined as the amount if work done in moving a unit charge from infinity to that point against electric forces.
resistance is directly proportional to length of the wire and is inversely proportional to its area of cross section.
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