Two fixed particles, each of charge 5.9 ✕ 10−6 C, are 8 cm apart. What force (in N) do they exert on a third particle of charge −2.3 ✕ 10−6 C that is 5 cm from each of them? (Express your answer in vector form. Assume that the +x-axis is to the right and the +y-axis is up along the page. Further assume that the two particles sit along the x-axis and the third particle sits above the x-axis.) F = ? N
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i think the answer is a, hope this is right, that would be my best guess.

increase masses, decrease separation

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