ACT Science Practice Question #1823 (Hard (580)) | Test Citadel
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ACT Science Difficulty: Hard (580)

Digital ACT Science Practice Question #1823

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If a soft ferromagnetic iron rod is inserted into the core of the solenoid, the measured magnetic field B will: 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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Socratic AI Engine Step-by-Step Derivation
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Iron core multiplies magnetic field strength by hundreds of times.

Masterclass Solution & Distractor Trap Analysis

Ferromagnetic cores dramatically increase flux density (B = mu * n * I, where mu_iron >> mu_0)....

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

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