En un freno hidráulico, la sección del émbolo de las pastillas es el doble que el del pedal del freno e igual a 5 cm². La fuerza que hacemos en el pedal es de
100 N. Determina la presión del sistema y la fuerza ejercida en las pastillas.
Dato g = 9,81 m/s².

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e