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Practice Exam 1 - Spring 2007

# Practice Exam 1 - Spring 2007 - PH2200 EXAM I INSTRUCTIONS...

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PH2200 EXAM I SPRING 2007 1. You have four metallic marbles that have different colors but are identical in size. Each marble has an initial charge of either 0.2 μ C or +0.4 μ C. You observe that red attracts blue, blue attracts green, and green attracts black. Red and black are brought in contact with each other so that they have the same charge after they are separated. Afterwards, you observe that red now repels blue. What is the initial charge of each marble? (A) Red 0.2 μ C; Blue +0.4 μ C; Green 0.2 μ C; Black 0.2 μ C (B) Red 0.2 μ C; Blue +0.4 μ C; Green 0.2 μ C; Black +0.4 μ C (C) Red +0.4 μ C; Blue 0.2 μ C; Green +0.4 μ C; Black +0.4 μ C (D) Red +0.4 μ C; Blue 0.2 μ C; Green +0.4 μ C; Black 0.2 μ C (E) You have lost your marbles in your attempt to answer this question (this is not the correct answer). 2. Consider two metal spheres that are close to one another without touching. One of them carries no net charge while the other carries a net negative charge.
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Practice Exam 1 - Spring 2007 - PH2200 EXAM I INSTRUCTIONS...

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