20. (a) common transparent tape becomes charged when pulled from a dispenser. if one piece is placed above another, the repulsive force can be great enough to support the top piece’s weight. assuming equal point charges (only an approximation), calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a 10.0 mg piece of tape held 1.00 cm above another. (b) discuss whether the magnitude of this charge is consistent with what is typical of static electricity.

Explanation:

Charge of particle = q

The particles have same charge

r = Distance between charge

k = Coulomb constant =

m = Mass of particle = 10 mg

g = Acceleration due to gravity = 9.81 m/s²

Electrostatic force is given by

According to Newton's second law

Here, both the electrostatic and inertial force is conserved

The charge of the particles is

The charge of the particles is very low as compared to typical static electricity

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.