ACT Science Practice Question #1303 (Medium (30)) | Test Citadel
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ACT Science Difficulty: Medium (30)

Digital ACT Science Practice Question #1303

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A student tested the electrical resistance of four copper wires of varying lengths and cross-sectional areas at $20^\circ\text{C}$: • Wire 1: Length $1.0\text{ m}$, Area $1.0\text{ mm}^2$, Resistance $0.017\text{ }\Omega$ • Wire 2: Length $2.0\text{ m}$, Area $1.0\text{ mm}^2$, Resistance $0.034\text{ }\Omega$ • Wire 3: Length $1.0\text{ m}$, Area $2.0\text{ mm}^2$, Resistance $0.0085\text{ }\Omega$ • Wire 4: Length $2.0\text{ m}$, Area $0.5\text{ mm}^2$, Resistance $0.068\text{ }\Omega$ Based on these results, which combination of physical properties yields the highest electrical resistance?
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Examine extreme data points: check Wire 4 ($R = 0.068$) which has the highest length (2.0 m) and smallest area (0.5 mm²).

Masterclass Solution & Distractor Trap Analysis

Resistance formula is $R = \rho L / A$. Increasing length $L$ directly increases resistance, while decreasing cross-sectional area $A$ inversely increases resistance. Wire 4 (longest length 2.0 m and smallest area 0.5 mm²) exhibited the hig...

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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