An infinite sheet of charge is located in the y-z plane at x = 0 and has uniform charge denisity σ1 = 0.35 μc/m2. another infinite sheet of charge with uniform charge density σ2 = -0.54 μc/m2 is located at x = c = 31 cm.. an uncharged infinite conducting slab is placed halfway in between these sheets ( i. e., between x = 13.5 cm and x = 17.5 1)what is ex(p), the x-component of the electric field at point p, located at (x, y) = (6.75 cm, 2). what is σa, the charge density on the surface of the conducting slab at x = 13.5 cm?

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