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Q. What is the minimum length of the string whose fundamental frequency is 272Hz? The speed of sound at this temperature is 340m/s.

Q. Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must either both be positive or both be negative.

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