(a) A medical researcher is using the uniform electric field (E = 2400 NC-¹) generated by an electrophoresis setup to isolate a charged protein of interest (q = +160e) from an uncharged patient sample. As shown in panel (A), when the patient sample is loaded between the positive and negative terminal, the charged protein of interest migrates 12 cm toward the negative terminal.
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- Identical 42 μC charges are fixed on an x axis at x = ±3.4 m. A particle of charge q = –20 μC is then released from rest at a point on the positive part of the y axis. Due to the symmetry of the situation, the particle moves along the y axis and has kinetic energy 1.2 J as it passes through the point x = 0, y = 4.5 m. (a) What is the kinetic energy of the particle as it passes through the origin? (b) At what negative value of y will the particle momentarily stop?(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 8.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 3.00 mC. How many electrons are added for every 109 electrons already present?(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 13.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?
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