A physical change can be described as a change that doesn't affect the chemical composition of the substance; while a chemical change does alter the chemical composition of the substance. Place the
following examples under the correct heading that describes the change that occurs.
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a raw egg is fried
change in shape or phase
ice melting
matter is conserved
nitrogen gas and hydrogen gas combine
and form ammonia
rusting of a nail

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