Physics · Electromagnetism
In a long uniform copper rod carrying a steady current I, the free electrons drift with a constant speed v. A tiny copper bead placed inside a smooth, frictionless longitudinal hollow channel within the rod is initially at rest relative to the lattice. If the current is switched off suddenly, what motion will the bead exhibit relative to the rod?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Oscillate about its initial position
- 2Remain at rest relative to the rod
- 3Accelerate in the direction opposite to the former electron drift
- 4Continue moving in the same direction as the former electron drift at speed v✓
Correct answer
Continue moving in the same direction as the former electron drift at speed v
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