A rod with an unknown charge attracts a plastic ball. Which of the following is possible?

Question

BlackTom AI · Accepted Answer

To analyze the scenario, I’ll first restate what the setup implies: a rod with an unknown charge is attracting a plastic ball. This implies the attraction is due to opposite charges between the rod and the ball.
Option 1: The rod is negative and the ball is positive. Opposite charges attract, so this pairing would produce the observed attraction. This is consistent with the phenomenon described.
Option 2: The rod is uncharged and the ball is uncharged. If both are truly uncharged, there would be no electrostatic attraction due to charge; any attraction would have to come from a different effect (not described here), so this option fails to explain the given attraction.
Option 3: The rod is positive and the ball is positive. Like charges repel, which would lead to repulsion, not attraction, making this option incompatible with the scenario.
Option 4: The rod is negative and the ball is negative. Again, like charges repel, so this arrangement would not produce attraction, contradicting the observed effect.
In summary, only the charge arrangement with opposite signs (negative rod, positive ball) accounts for the attraction described, while the others either yield no interaction or produce repulsion rather than attraction.

A rod with an unknown charge attracts a plastic ball. Which of the following is possible?单项选择题

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