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AP Physics C: E&M
13.5 Circuits with Resistors and Inductors (LR Circuits)
13.4 Inductance
AdvancedMCQMathematical18.6k
Circuit with a variable-inductance coil whose core is removed over time.
Circuit with a variable-inductance coil whose core is removed over time.
A circuit consists of an ideal battery of constant emf \(\mathcal{E}\), a resistor of resistance \(R\), and an inductor whose inductance \(L(t)\) varies with time as a ferromagnetic core is pulled out of the coil. Which of the following differential equations correctly describes the current \(I(t)\) in the circuit while the core is being pulled?

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