A parallel-plate capacitor , made of two circular plates of radius R = 10 cm, is being charged. What is the magnitude of the induced magnetic field induced by the displacement current between the plates of the capacitor at a distance r = 2 cm from the axis of the plates at a time when the electric field varies at the rate dE/dt = 2 × 1012 V/m s?

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm