Which of the following statements about Newton's Third Law is the most true? a
The forces acting upon two objects are dependent on the initial velocities of the objects
b
The law of conservation of momentum is obeyed in all systems
c
The two objects colliding will have a change in their masses, but not necessarily their velocities
d
The forces acting on two colliding objects are equal, but the effects of those forces on those objects may not be equal

the answer is b, have negligible mass

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