How strong is the attractive force between a glass rod with a 0.680 µc charge and a silk cloth with a −0.590 µc charge, which are 11.0 cm apart, using the approximation that they act like point charges? (enter the magnitude in newtons.)

Explanation:

Data provided:

Charge on the glass rod, Q = 0.680 μC = 0.680 × 10⁻⁶ C

Charge on the silk cloth, q = 0.590 μC = - 0.590 × 10⁻⁶ C

Distance between glass rod and the silk cloth, r = 11.0 cm = 0.11 m

now,

The force between (F) the charges is given as:

where,

k is the Coulomb's constant = 9 × 10⁹ N.m²/C²

on substituting the respective values, we get

or