Neurons are components of the nervous system of the body that transmit signals as electrical impulses travel along their length. These impulses propagate when charge suddenly rushes into and then out of a part of the neutron called an axon. Measurements have shown that, during the inflow part of this cycle, approximately 5.60×1011 ions/m Na+ (sodium ions) per meter, each with charge +e, enter the axon.   How many coulombs of charge enter a 1.00 cm length of the axon during this process? Express your answer in nanocoulombs.

Nerve cells in your body can be electrically stimulated; a large enough change in a membrane potential triggers a nerve impulse. Certain plants work the same way. A touch to mimosa pudica, the “sensitive plant,” causes the leaflets to fold inward and droop. We can trigger this response electrically as well. In one experiment, investigators placed electrodes on the thick tissue at the base of a leaf. The electrodes were 3.5 mm apart. When the electrodes were connected to a 47 μF capacitor charged to 1.5 V, this stimulated a response from the plant.a. Eventually, all the charge on the capacitor was transferred to the plant. How much charge was transferred?b. What was the approximate electric field between the electrodes?

Cardiac defibrillators must be able to supply a high voltage very quickly, and so use capacitors.  If a certain defibrillator has a 154 µF capacitor charges to 2,697 V.  If this electrical charge is released into the patient in a time of 4.85 milliseconds, what is the (average) power, in watts?

Saccharomyces cerevisiae is a single-celled yeast that is often used as a model for eukaryotic cells, as it contains all of the important organelles of these cells. The genome of Saccharomyces cerevisiae, commonly known as brewer's yeast, has been completely mapped, making it suitable for genetic engineering experiments. The amount of electric charge on the cell walls plays a significant role in the interaction of these cells with their environment. To determine -9 the electric charge on yeast cells, which is a function of their size, the cells are often placed in electric fields and their motion in these fields is measured. In one such experiment, Saccharomyces cells of mass 3.00 x 10- 9 placed at rest in a uniform electric field of magnitude 10.0 N/C were measured to be traveling with a speed of 3.10 x 102 um/s after traversing a distance of 20.0 μm along the direction of the electric field. What was the magnitude and sign of the charge on this batch of yeast cells? (a) magnitude (in…