Nolan tests how distance from a magnet affects the strength of the magnetic field. He tapes a magnet and a wooden ruler to the table so the ruler's end touches the magnet. Next, he places paper
clips at different distances from the magnet and records his observations. What does he observe?
The closer the paper clips are to the magnet, the less they are attracted to it.
The closer the paper clips are to the magnet, the more they are attracted to it.
The magnet attracts the same number of paper clips at all distances.
O The magnet does not attract any paper clips at all at any distance.

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