Multiple-Choice Homework Problem 12.3 A copper wire of length l and cross-sectio

Question

Multiple-Choice Homework Problem 12.3 A copper wire of length l and cross-sectional area A has resistance R. If the cross-sectional area is doubled while the length remains l, what is the new resistance in terms of the original resistance R? Select One of the Following: (a) R (b) 2R (c) 4R (d) R/2 (e) R/4

Multiple-Choice Homework Problem 12.4 Select the following statement which is true about current flow. Select One of the Following: (a) Current flows along lines of equal potential. (b) Current flows from low potential to high potential. (c) Current flows from high potential to low potential. (d) The direction current flows is independent of the potential.

Explanation / Answer

1. R = L/A

Resistance is inversely proportional to cross sectional area, So if A is doubled, Resistance gets havled

So answer is (d) R/2.

2. Current flows from high potential to low potential

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