character: Dr. Patel
topic: AC vs. DC Current
grade: 10
subject: Physics
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character: Engineer Smith
topic: Differences between AC and DC
grade: 10
subject: Physics
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character: Professor Lee
topic: Applications of AC and DC in daily life
grade: 10
subject: Physics
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character: Scientist Jones
topic: History of AC and DC Current
grade: 10
subject: Physics
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