Total charge of electrons

What is the total charge of all the electrons in 2.37 kg of H2O?

Two conducting wires each of length L are...

Two conducting wires each of length L are connected to a knob, whereby a total electric charge Q is deposited onto two small spherical metallic spheres, each of mass m and diameter d, at the end of the wires. We observe each wire of this electroscope to lie at an angle q from the vertical. Find an expression for the charge Q ...continues

capacitance and electric potential

A 2.61 micro F capacitor is charged to 1380 V and a 7.79 micro F is charged to 490 V. These capacitors are then disconnected from their batteries, and the positive plates are now connected to each other and the negative plates are connected to each other. What will be the potential difference across each? What will be the charge ...continues

capacitor

A 0.188F capacitor is desired. What area must the plates have if they are to be separated by a 1.67mm air gap?

Capacitor

Im going to paste the problem here but for the image can you guys please follow the link below. A capacitor of capacitance C1 is given charge Q0, as shown. It is then connected as shown to another uncharged capacitor of capacitance C2. With clearly displayed reasoning, find the voltage across each capacitor and the charge on ...continues

Electric Force

Electric Force 1. A charge +q is at the origin. A charge -2q is at x = 4.00 m on the x axis. For what finite value(s) of x is (a) the electric field zero? (b) the electric potential zero?

Electric Force

The electric field everywhere on the surface of a thin spherical shell of radius 1.750 m is measured to be 1890 N/C and points radially toward the center of the sphere. (a) What is the net charge within the sphere's surface? (b) What can you conclude about the nature and distribution of the charge inside the spherical shell?

Electric Force

Three charges are placed on the x and y axes as follows:+2q at the origin (0,0); -q at (a,0); +q at (0,a). Find the magnitude and direction of the electric field at the point (a/2,a/2), mid-way between the +q and -q charges.

Power

You buy a 60W lightbulb in Europe, where electricity is delivered to homes at 240V. If you use the lightbulb at home in the United States, how bright will it be relative to 60W 110V bulbs? Calculate how much power it will consume.

electric current

You have a hair dryer that can 'handle' an average power P when connected to our US wall plugs, which provide an rms AC voltage of 110 volts. What is the rms current drawn? Call it I. What is the resistance of your drier? Call this R. You now travel to Luxembourg, where the AC outlet in the wall provides 220 volts, again rms. Ho ...continues