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Q. A thin 12.7m long copper rod in a uniform magnetic field has a mass of 68g. While the rod carries a current of 0.291 A, it floats in the magnetic field. What is the field strength of the magnetic field?

Q. A 3 liter aluminium cylinder at 5°C is filled to the brim with gasoline at the same temperature. If the aluminium and gasoline are warmed to 62°C, how much gasoline spills out? [Hint: Be sure to account for the expansion of the container. Also, ignore the possibility of evaporation, and assume the volume coefficients are good to three digits.

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