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Resistivity Question
a metal wire of length 1.4m has a uniform cross sectional area= 7.8x10^-7
resistivity of the metal= 1.7x10^-8
a) calculate resistance => i got this part as 0.03 ohms
b) the wire is now stretched to twice its original length by a process that keeps its volume constant. if the resistivity of the wire remains constant show that the resistance increases to 4R.
for PART B i assumed that the resistance would be 0.12 ohms for obvious reasons.
However when i was double checking for the answer RA/L does not equal the resistivity value.
any help would be appreciated
resistivity of the metal= 1.7x10^-8
a) calculate resistance => i got this part as 0.03 ohms
b) the wire is now stretched to twice its original length by a process that keeps its volume constant. if the resistivity of the wire remains constant show that the resistance increases to 4R.
for PART B i assumed that the resistance would be 0.12 ohms for obvious reasons.
However when i was double checking for the answer RA/L does not equal the resistivity value.
any help would be appreciated
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