Below is a picture of a swimmer in a river. looking at the vectors being added is the swimmer going downstream or upstream? : and9gcrazps4-k9uy3om9eryny2w6fr1s6s maq3dcncwdbijbdbc42zc question 10 options: downstream, the current is the swimmer go faster relative to the land. upstream, the current is slowing the swimmer down.

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i don't understand. explain it clearly

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