A 100-cm-long copper wire of radius 0.50 cm has a potentialdifference across it sufficent to produce a current of 3.0 A at 20def Celcius a) What is the potential difference ? b) If the temperature of the wire is increased to 200 degressCelcius what potential differnce is now required to produce acurrent of 3.0 A?

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A 100-cm-long copper wire of radius 0.50 cm has a potentialdifference across it sufficent to produce a current of 3.0 A at 20def Celcius  a) What is the potential difference ?  b) If the temperature of the wire is increased to 200 degressCelcius what potential differnce is now required to produce acurrent of 3.0 A?

lamanocornudaW · Accepted Answer

A) ? V=IR,I=3.0A,R=?L/A(ρ∗length/area)ρ=1.68×10−8; Area =π⋅r2 R=2.14×10−4; ? V=3.0A∗2.13×10−4=6.42×10−4V B) ?=?o[1+?(T−To)]=1.68×10−8[1+3.9×10−3(200−20)]=2.859×10−8 Now you can find a new resistivity using the same equationabove. Once you have found that then you use Ohm&#039;s law again( V=I⋅R) and that will five you a potential difference in Volts.

A 100-cm-long copper wire of radius 0.50 cm has a potentialdifference across it sufficent to produce a current of 3.0 A at 20def Celcius a) What is th

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