Charges and are kept apart in kerosene oil whose relative permittivity is

PHYSICS · Subjective · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Charges

q_1 = 2.0\times 10^{-7}\,\text{C}

and

q_2 = -4.0\times 10^{-7}\,\text{C}

are kept

5.0\,\text{cm}

apart in kerosene oil whose relative permittivity is

\varepsilon_r = 2.0

. Determine the magnitude of the electrostatic force between the charges, expressing your answer to two significant figures in newton.