what is mean by electrical resistivity of a material. derive its unit. describe an experiment to study the factor on which the resistance of a conducting wire depends..
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Answer: The electrical resistivity of a material is defined as the resistance of a conductor made of that material of unit length and unit cross-sectional area. ... When the length of the wire is doubled, then the ammeter reading decreases to half its previous value i.e., current through the wire is halved
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resistivity : when a conductor has length 1m
and cross sectional area is 1m²,then resistance of conductor is called resistivity.
R=pl/A
put l=1m and A=1m².
R=P
this resistance is called resistivity.
resistance of a conductor depends on dimensions of the conductor(volume ,length,area).
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