A2L Item 220
- Description: Identify the object having lowest resistance.
- Goal: Reason regarding resistance
- Source: 283-550 Resistance and geometry
- Keywords: Electromagnetism, Resistance
The question for students:
Which object below has the lowest resistance? All three have length L and are made out of the same material.
- #1
- #2
- #3
- Both #1 and #3 have the same, and theirs is less than the resistance of #2.
Commentary for teachers:
Answer
(2) Students should be able to reason that the contribution to the total resistance from a slice of material decreases as the area increases.