La tía Pati va del Parque (A) hasta el Hospital de Lanco (B) por el camino señalado, tardando solo 5 minutos en hacerlo
a) ¿Cuál es la distancia que recorrió?
b) ¿Cuál fue su desplazamiento?
c) ¿Qué valor resulta al dividir la distancia recorrida por el tiempo (en seg) ?, ¿Cuál es el resultado de dividir el desplazamiento por el tiempo?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia