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Circuits: A certain material has a voltage of 120 V across 10 A and the length of the wire is 25 m, while the diameter is 5 mm. What it its resistivity?
 one year ago
 one year ago
Circuits: A certain material has a voltage of 120 V across 10 A and the length of the wire is 25 m, while the diameter is 5 mm. What it its resistivity?
 one year ago
 one year ago

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jennychan12Best ResponseYou've already chosen the best response.1
\[V = IR\] \[P = IV\] \[R = \frac{ \delta L }{ A }\] i used the first one (R=V/I) is that right?
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
and you're not given the constant.
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
so first find the resistance
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
yeah i got that 12 ohms
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
using the first formula right?
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
that's it? but what are the length and diameter given for?
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
once you find R , use that and given diameter and length to find resistivity which is \[\delta\]
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
_ grr. i thought the R was the resistivity.. fdjsalkfhdjkshfklhg got that question wrong on the quiz >:(
 one year ago

jennychan12Best ResponseYou've already chosen the best response.1
oh okay. my teacher didn't explain clearly. :(
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
well, you know now, will help you in future exam
 one year ago
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