We have a copper wire of resistance R .This wire is pulled so that its length is doubled. Find the new resistors of the resistance of the wire in terms of its original resistance.
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Also, according to Ohm's law, the current in a circuit is proportional to the voltage: V= IR, R is the proportionality constant called resistance. ... So the new resistance is 4 times the original resistance. (ii) Resistivity is independent of the length and area of cross section of the wire and hence it will not change.
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