Albert pushes a 6 kg box across a level floor. He pushes with a force of 43 N and observes that the box accelerates in the direction of his push at a rate of 2 m / s 2 . What is the net force acting on the box

12 N

Explanation: according to Newton second law of motion,

F - Fr = ma.

Where F = applied force = 43 N, Fr = frictional force =?, m = mass of box = 6kg, a = acceleration = 2m/s²

43 - Fr = 6(2)

43 - Fr = 12

Fr = 43 - 12

Fr = 31 N

If applied force (F) is 43 N and the frictional force (Fr) is 31 N The resultant forge is 43 - 31 = 12 N

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