Charges in static electricity are typically in the nanocoulomb (nC) to microcoulomb (μC) range. What is the voltage 5.00 cm away from the center of a 1-cm diameter metal sphere that has a −3.00 nC static charge?

You have likely experienced "static shock" recently.  The magnitude of charge transferred when you walk across a carpet, reach out and touch a doorknob, and unintentionally give yourself that static shock is around 1.88 nC (nC stands for nano-Coulomb).  In units of Giga-electrons, about how many electrons are transferred when you experience static shock?

Two parallel plates of charge (+) and (-) are placed with a distance of d = 5 mm (see picture). The charge density of each plate is the same, namely 17.7 μC/m². A positive charge q = +3 nC with mass m = 30 x 10^-30 kg is released from rest starting from the left plate. What is the kinetic energy of this charge when it arrives at the right plate?

A point charge q1 = +5.00 μCoul is held in fixed space. From a horizontal distance of 6.00 cm, a small sphere with mass 4.00*10^-3 kg and charge q2 = +2.00 μCoul is fired toward the fixed charge with an initial speed of 50.0 m/s. Gravity can be neglected. What is the distance between the two charges when the speed of the moving charge q2 is 20.0 m/s?

Red blood cells often become charged and can be treated as point charges. Healthy red blood cells are negatively charged, but unhealthy cells (due to the presence of a bacteria, for example) can become positively charged. In the figure, three red blood cells are oriented such that they are located on the corners of an equilateral triangle. The red blood cell charges are A = 1.90 pC, B = 6.50 pC, and C = -4.80 pC. Given these charges, what would the magnitude and direction of the electric field be at cell A? (1 pC = 1 x 10-12 c.) Magnitude- Direction-

There is a 30 microcoulomb charge at the origin.  There is a 154 microcoulomb charge on the x axis at x = 4 meters, and a 146 microcoulomb charge on the y axis at y = 4 meters.  What is the magnitude of the net force from the interaction between the charges on the 30 microcoulomb charge at the origin.  Give you answer in Newtons

three-point charges have equal magnitudes, two being positive and one negative. these charges are fixed to the corners of an equilateral triangle as the drawing shows. the magnitude of each of the charges is 5.5 Uc and the length of the sides of the triangles are 2.5 cm. calculate the magnitude of the net force that each charge experiences. for this question you should have three answers in other words. What is FA, Fb, Fc? 

Measuring the Charge. You and your team are designing an experiment where two spherical insulating beads of diameter 0.45 cm and mass 0.15 g are strung together on a fine thread that passes through microscopic holes drilled through their centers. When hung vertically, the lower bead rests on a knot at the bottom of the thread and the upper bead rests upon the lower bead. When placed inside a vacuum chamber and exposed to X-rays (highly energetic electromagnetic radiation), the beads acquire equal, uniform distributions of positive charge on their surfaces due to the loss of electrons ejected when struck by the X-rays. During this experiment, the beads are hung vertically, and a gap forms between them as if the top bead were levitating above the lower one, presumably due to the repulsive electrostatic force between them. The gap, that is, the vertical separation between the top of the lower bead and the bottom of the upper bead, is 0.27 cm. (a) How much excess charge is on each bead?…

A 3.0-mm-diameter copper ball is charged to 90  nC. What fraction of its electrons have been removed? The density of copper is 8900  kg/m3.

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