Four point charges of magnitude 3.6 mu or micro cc are at the corners of a square of side 4 m. (a) find the electrostatic potential energy if all of the charges are negative.

- 4.4 x 10⁴ J

Explanation:

q = charge on each point charge = - 3.6 x 10⁻⁶ C

a = length of side of square = 4 m

L = length of diagonal of the square

Length of the diagonal of the square is given as

L = a √2

L = 4 √2

L = 5.66 m

Electrostatic potential energy is given as

inserting the values

U = (4 (9 x 10⁹) (- 3.6 x 10⁻⁶)/4) + (2 (9 x 10⁹) (- 3.6 x 10⁻⁶)/5.66)

U = - 4.4 x 10⁴ J

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

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