A red wheel speeds up with tangential acceleration aaa at a distance rrr from its center. A blue wheel has a tangential acceleration of 2a2a2, a at a distance 4r4r4, r from its center. How does the angular acceleration of the red wheel \alpha_\text {red}α red alpha, start subscript, start text, r, e, d, end text, end subscript compare with the blue wheel \alpha_\text {blue}α blue alpha, start subscript, start text, b, l, u, e, end text, end subscript?

what is the actual question though?

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