An electric utility company supplies a customer's facility from the main power lines (effective voltage Vo=150 V) with two copper wires. Each wire has diameter d=5.64 mm and length l=34.83 m. The customer load current is known to be I=163.5 A. Required:
a. What is the voltage V at the customer facility for the given load current?
b. How much power P0 is delivered by the main lines?
c. How much power P is received by the facility?
d. How much power Ploss is lost in the supply wires?

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