physics homework1
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PHYS 183 Paper & Pencil Homework #2 Due in class Thursday, May 29 Instructions Provide neat and detailed solutions on a separate sheet of paper. You must follow the Homework Guidelines (available on Canvas) for full credit. Problem 1 (chapter 29)
A typical nerve cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outside surface - the cell wall thus acts like a capacitor. If the cell (assumed to be spherical) has a diameter of 5.0 ∙ 10!! m and a wall thickness of 7.0 nm, and if the dielectric constant of the cell wall is 9.0, what is the capactiance of the cell? (Be sure to describe and justify any assumptions or approximations that you decide to make.) Problem 2 (chapter 29)
A battery with an emf of 42 V is connected to the two capacitors shown in the figure at right. Afterward, the charge on capacitor 2 is 3.8 ∙ 10!! C. What is the capacitance of capacitor 2?
Problem 3 (chapter 30)
A student does an experiment to see how long it takes for his 1.5 V flashlight battery to discharge when connected to a 6.0 Ω resistor. With a voltage meter, he measures the potential difference between the terminals of the battery and makes the plot shown at right. How much total charge passed through the resistor during this experiment?
Problem 4 (chapter 31)
Find the current through the 20 Ω resistor in the figure at right.