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Q. A string vibrates in five segments to a frequency of 460Hz. (a) what is its fundamental frequency? (b) What frequency will cause it to vibrate in three segments?

Q. Two uncharged metal balls, X and Y, stand on glass rods, are in touch as shown to the right. A third ball Z, carrying a positive charge, is brought near the first two (closer to Y than X). Then the first two balls are separated from each other, and ball Z is finally removed. What are the charges (if any) on each of the balls?

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