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. How much rms current and how much average power are put into your hair drier there, and what is its resistance in Europe? Express your answers as multiples or fractions of the situation in the US for each. Instead, you find an outlet that is stated to provide a peak-to-peak voltage of 220 volts. How much rms current and how much average power does that put into you... click for more