EOC_Solution_28_31

# EOC_Solution_28_31 - 28.31 Solve(a Let the new current be I...

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28.31. Solve: (a) Let the new current be I such that I = 2 I where I is the original current. The current density is J I A = . Since the area of cross section of the wire remains the same, we have A I J I J = = ′ = = J I I J J 2 That is, doubling the current doubles the current density. (b) Conduction-electron density is a material’s characteristic value, and does not depend on external factors. Thus n = n . (c) The mean time between collisions is a material’s characteristic value, and does not depend on external factors.
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• Spring '09
• Abbas
• Physics, Current, Fundamental physics concepts, 2J, Drift velocity

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