USCG Exam PracticeDC circuits and electronic principles
A conductor is replaced with one of the same material and length but twice the cross-sectional area. According to Ohm's law principles, how does the resistance of the new conductor compare to the original?
- A. It doubles, because more material is present.
- B. It remains the same, because the material and length are unchanged.
- ✓ It is reduced by half, because greater cross-sectional area decreases resistance.Correct
- D. It is reduced by one-quarter, because resistance varies with the square of the area.
Why C is correct
Resistance is inversely proportional to cross-sectional area; doubling the area halves the resistance. The relationship is linear with area, not squared, so option D is incorrect. (NEETS Mod. 1 §3-1)
Cited:NEETS Mod. 1 §3-1