After brushing, fluffy's fur has a charge of 8.0 x 10^-9 coulombs and her plastic brush has charge of -1.4× 10^-8 coulombs. if the distance between the fur and brush is roughly 5.0 × 10^-1 meters, what is the approximate magnitude of the force between them?

Given data:

charge 1 (q₁) = 8.0 × 10⁻⁹ coulombs

charge 2 (q₂) = -1.4  × 10⁻⁸ coulombs

distance between fur and brush (r) = 5.0  × 10⁻¹ m

We know that,

           The couloumb's law describes the charge between two particles

Mathematically,

               F = k.(q₁ . q₂)/r²         (i)

             Where F = Force between particles

                         k = constant, 8.99 × 10⁹ Nm²/C²   (ii)

keep the charge, distance values and value of k in equation  (i), to determine the magnitude of force

                 F = 8.99 × 10⁹ ×{ (8.0 × 10⁻⁹) × ( -1.4  × 10⁻⁸)} / (5.0  × 10⁻¹)²

                    = -4.02 × 10⁻⁶  

The force is negative means "the force is attractive"

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