ACT Science Practice Question #1822 (Hard (540)) | Test Citadel
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ACT Science Difficulty: Hard (540)

Digital ACT Science Practice Question #1822

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According to the formula B = mu_0 * (N/L) * I, what would be the predicted magnetic field if a 400-turn solenoid operated with a 4.0 A current? Experiment Context (Magnetic Field of an Air-Core Solenoid): Physics students measured the internal axial magnetic field B (in milliteslas, mT) of a 20 cm solenoid while varying electric current (I) and total number of wire turns (N): Table 23: - 100 turns, Current = 1.0 A: B = 0.63 mT - 100 turns, Current = 2.0 A: B = 1.26 mT - 100 turns, Current = 3.0 A: B = 1.88 mT - 200 turns, Current = 1.0 A: B = 1.26 mT - 200 turns, Current = 2.0 A: B = 2.51 mT - 400 turns, Current = 2.0 A: B = 5.03 mT
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Double current from 2A to 4A: 5.03 * 2 = 10.06 mT.

Masterclass Solution & Distractor Trap Analysis

At 400 turns and 2.0 A, B = 5.03 mT. Doubling current to 4.0 A doubles B to 10.06 mT....

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

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