When a 12 N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of friction acting on the box is 1) 0N
2) Between 0N and 12N
3) Exactly 12 N
4) Greater than 12N

The force of friction acting on the box is greater than 12N

For an object to move, the applied force has to be larger than the maximum force of static friction. If the force applied is less than the maximum force of static friction, the object would remain at rest.

Therefore, if a 2 N horizontal force is applied to a box and the box remains at rest, this mean that the force applied is less than the force of friction acting on the box. Hence the force of friction acting on the box is greater than 12N

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12N

Explanation:

when a force is applied to a body but still stays at rest or moves at a constant speed , the frictional force is equal to the force applied

50 inches should be the resultant vector

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