ACT Science Practice Question #1222 (Medium (30)) | Test Citadel
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ACT Science Difficulty: Medium (30)

Digital ACT Science Practice Question #1222

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In a physics experiment testing electromagnetic induction, a student rotates a planar copper coil of area $0.05\text{ m}^2$ inside a uniform magnetic field of $0.4\text{ T}$. When the number of turns in the coil is increased from $50$ to $150$ while maintaining constant angular velocity, the peak induced electromotive force (EMF) will: (Faraday's Law: $\mathcal{E}_{peak} = N B A \omega$)
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Direct proportionality: $\mathcal{E} \propto N$. If $N$ triples, $\mathcal{E}$ triples $\rightarrow$ Choice A.

Masterclass Solution & Distractor Trap Analysis

According to the equation $\mathcal{E}_{peak} = N B A \omega$, induced EMF is directly proportional to the number of turns $N$. Increasing $N$ from $50$ to $150$ represents a threefold increase ($150/50 = 3$). Since $B$, $A$, and $\omega$ a...

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

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