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1. ### Copper Wire Question 2?

E = V / L = I R / L = I ( ρ L /A ) / L = I ρ / A = I ρ /(π r ^2) = 0.741 A * 1.72 10^-8 Ohm m/(3.1415*0.00344^2 m^2) = 3.43 10^-4 N/C

1 Answers · Science & Mathematics · 01/04/2014

2. ### A copper wire has radius r = 0.0205 cm, is 2.95 m long, has resistivity ρ = 1.72 · 10−8 Ω m, and carries a c?

...conductivity sigma = 1/resistivity = A/( L *resistivity), L = length But R = (resistivity)* L /A So sigma = L /AR j = i/A i = current So...

2 Answers · Science & Mathematics · 27/09/2012

3. ### resistivity of salt water solution?

R = ρ* L /A = 8.0645/0.25*0.1130/(π*(0.0130^2)) = 6870Ω

1 Answers · Science & Mathematics · 07/03/2010

4. ### Why is ohm's law voltage = current times resistance?

... (from definition of current density, n is the charge carrier q density) V = (b * I * L )/ nq^2 A Compare w/ definition of resistance: R = (rho)*( L /A) where rho is the resistivity...

2 Answers · Science & Mathematics · 21/05/2012

5. ### Magnetic field applied to a semiconductor?

..., the semiconductor has a resistance, R given by: R = V( L )/I( L ) = (.078)/(0.0015) = 52 Ohms Now the mobility of the current carrier is given by the drift velocity: v(d) = μE(W) where...

1 Answers · Science & Mathematics · 18/04/2007

6. ### Answer for Electromagnetism Questions?

.... Beyond r = R , B*2pi* r = u0i or B = u0i/(2pi* r ). Q3 - ? Q4 - don't remember dipole moment Q5 - because force = il x B where l and B are vectors, and the cross-product of two aligned...

1 Answers · Science & Mathematics · 01/08/2011

7. ### How much mass does gravity have?

...want to express the final answer in terms of the total mass m and the total radius R , we should try to avoid working with the density and the explicit expression for the...

14 Answers · Science & Mathematics · 18/06/2008

8. ### Conductivity and Drift Velocity?

A. R = V/I Resistivity = R *area/ L Conductivity = 1/resistivity B. Nelectrons/s = I...

1 Answers · Science & Mathematics · 06/05/2009

9. ### With regard to the flow of electric current, what is resistance?

... to the flow of current carrier and hence to the flow of currend,as current...of area of crossection A and length l ,having the drift velocity v,.../ml,Resistance( R )=ml/Ane^2t,

5 Answers · Science & Mathematics · 03/01/2014

10. ### W Boson questions.?

...spin-1 bosons which act as force carriers between quarks and/or ... ranges as: - R (W) ≈ R (Z) ≈ 2...as follows: - W+ -> l + + vl W- -> l - + vl'...

1 Answers · Science & Mathematics · 13/06/2008