A chihuahua gets loose from his yard and goes for a run in the neighborhood. He first runs 4 blocks east, then he got chased off by a schnauzer and had to run 4 blocks north. Then he got scared by a cat and ran 6 blocks south until he smelled someone cooking food outside and followed the smell 2 blocks east. They chase him off and he runs 3 blocks south and 3 blocks west. Then he wanders 2 blocks north looking for trees and fire hydrants. Where is he? What is his displacement?

conduction, convection, radiation

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

the rearrangement of particles in a physical change. hope this