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A protein has a net charge of +2 in an electric field at pH 4.5. What is the frictional drag experienced by the protein if it moves at a velocity of 0.0018 m/sec and the electric field strength is 10 J/C·m? Units for frictional drag should be in kg/s. (Hints: The net charge should be multiplied by the unit charge (q) value of 1.602 x 10-19 C. Use the conversion factor J = kg·m2/s2).

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