An object of mass m = 3.88 g and charge q = +43.0 microcoulombs is attached to a string and placed in a uniform electric field that is inclined at an angle of 28.4° with the horizontal, as shown in the figure below.
walk1974.gif
the object is in static equilibrium when the string is horizontal. calculate the magnitude of the electric field.
calculate the tension in the string.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

What structural formula represents 4 electrons shared between two atoms?