Discussion
A dielectric placed in an external field acquires
Answer: B
Correct answer: bound charge on its surfaces but no net charge overall
The field aligns or induces molecular dipoles, and within the material the head of one dipole cancels the tail of its neighbour, so charge appears only where that cancellation fails - at the two surfaces, positive on one and negative on the other. The magnitudes are equal, so the material remains neutral overall, and the charge is bound because it cannot leave the molecules that carry it.
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