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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
12.3 Magnetism and Current-Carrying Wires
12.1 Magnetic Fields
IntermediateMCQMathematicalConceptual14.3k
A schematic diagram showing two coaxial circular coils sharing a horizontal dashed central axis. On the left, a multi-loop cylindrical coil labeled primary coil is wired into a series circuit containing an open switch labeled S, a resistor labeled R, and a battery labeled \varepsilon. On the right, along the same horizontal dashed line, a closed single-loop circular ring labeled secondary coil rests on a flat horizontal support line. No other labels, lines, text, or axes appear.
Primary circuit with switch S and coaxial secondary coil.
A primary coil connected in series with a battery, an open switch, and a resistor is fixed in place. A lightweight, closed conducting secondary coil is aligned coaxially with the primary coil on a frictionless horizontal support and is free to move. The switch is closed, kept closed until a steady current is established, and then reopened.

Which of the following correctly describes the magnetic force exerted on the secondary coil and the induced current in the secondary coil during each of these three stages?

| | Force Immediately After Closing | Current in Steady State | Force Immediately After Reopening |
| :--- | :--- | :--- | :--- |

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