A5.0 kg box accelerates to the left while on the floor. it accelerates with a net force of 100 n (in spite of the 200 n of friction it encounters). what is the name of the force that accelerates the box?

Net force.

Explanation:

Given that

m = 5 kg

Net force ,F(net) = 100 N

Friction force ,Fr= 200 N

From the second law of Newton's

F(net) = m a

m= Mass  

a= acceleration

F(net) =  Net force act on the body

Therefore we can say that, the name of the force that will accelerate the box will be a Net force.

That is why the answer will be Net force.

Explanation:

Given

mass of box

Net force

frictional Force

using FBD

So the force acting on block which accelerates it is Net force  

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