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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
IntermediateMCQMathematicalConceptual21k
Two pendulum setups side by side labeled Pendulum 1 and Pendulum 2. A horizontal support line at the top anchors two vertical pivot lines. From the left pivot, a thin vertical rod connects to a solid filled gray rectangle labeled Plate 1. From the right pivot, a thin vertical rod connects to an identical rectangular outline labeled Plate 2, containing four vertical rectangular cutouts extending from the bottom upward, dividing the plate into comb-like teeth. Below both resting pendulums is a dashed rectangular region containing six evenly spaced cross marks indicating a uniform magnetic field directed into the page, labeled \vec{B}. Curved dashed arrows indicate the downward swing direction of both plates toward the magnetic field region. No other labels, lines, text, or axes appear.
Solid and slotted copper plates swinging into a uniform magnetic field.
Two pendulums of identical dimensions and mass are suspended from rigid lightweight rods and released from rest from the same initial angle. Pendulum 1 has a solid copper plate at its swinging end, while Pendulum 2 has a copper plate with narrow vertical slots cut into it to form a comb-like structure. Both pendulums swing downward into a region containing a uniform magnetic field directed perpendicular to their plane of oscillation. Which pendulum experiences greater magnetic damping as it enters the magnetic field, and why?

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