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"

the total distance traveled by the car is

30km + 49km = 79 km .