Electrical Potential Difference Problems 

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Hello. I'm a Korean engineering student. In Korea,It is so hard to study an engineering 😢 because there's no solution part even an answer of an practice problems in book. I complained to professor but he said university is the place where student have to find a answer by himself. But it is a fundamental thing in studying to check the answer and feedback to myself which part I did wrong.So im leaning to USA problem solving video now.

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