The diagram shows an electric motor. An illustration of a coil of wire connected to a battery labeled Z. The coil is inbetween a north pole and a south pole. The coil is rotating clockwise. The point where the positive electrode of the battery is connected to it is labeled Y. The long straight with that it rotates around is labeled W. The ring with a slit that the battery is connected to is labeled X. Which part of the motor is responsible for reversing the flow of current? W X Y Z

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