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Q. An object weighing 338 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 302 N. Immersed in oil; object weighs 313 N. Calculate the density of the object.

Q. An electron with an initial speed of 5.50×10^5 is brought to rest by an electric field. What was the potential difference that stopped electron?

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