Compare the force of gravity of the mass on the surface of the earth with the same mass if it was moved away two (2) earth's radii from the center of the earth.
( it’s number 6 )

Explanation:

According to law of gravitational fields You have already knew about factors that are affected on gravitational force

F ∝M1 ×M2

F ∝ (1 / R² )

F gravitational force

M1 ,M2 = Masses

R = Distance between two masses

There for if we double the length between masses force will be reduced 4 times when compared with previous value

F1 ∝ (1/R²) (1)

F2 ∝(1/(2R)²) (2)

(1)/(2) F1/4 = F2

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