To learn how to find internal forces for a statically indeterminate axially loaded structure by using deformation compatibility relationships and static equilibrium equations. a reinforced concrete pier supports a 350 kip axial compressive load as shown. the 12-in-diameter concrete pier is reinforced with 6 #8 (i. e., 1-in diameter) steel reinforcing bars (i. e., rebar). the steel and the concrete are assumed to be bonded together (i. e., there is no slip between them upon loading). the modulus of elasticity for the steel rebars is 29,000 ksi and the modulus of elasticity for the concrete is 4,200 ksi

b would be the answer

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