Two resistors, R1 and R2, are connected in parallel. R2 = 221.0
ohms, and the equivalent resistance
of the combination is 120.7 ohms.
What is the value of R1?
(Unit = ohm)

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

Answer(b) both involve the use of levers;