A pair of electrically charged objects attract each other with a force of 4 N when they are a distance of 10 m apart. If their charges stay the same, then what will be the attractive force between them when they are 20 m apart?

Consider the final arrangement of charged particles shown in the figure below. What is the work necessary to build such an arrangement of particles, assuming they were originally very far from one another? (Let 9₁ = 9.5 nC, 92 = 2.0 nC and 93-19.0 nC.) J (-12.0 cm, 0) 91 (-12.0 cm, -12.0 cm) 93 (12.0 cm, 0) 92 X

Consider the final arrangement of charged particles shown in the figure below. What is the work necessary to build such an arrangement of particles, assuming they were originally very far from one another? (Let 91 = 6.5 nC, 92 = 2.5 nC and 93 = -15.5 nC.) J (-12.0 cm, 0) 91 (-12.0 cm, -12.0 cm) 93 (12.0 cm, 0) 92 X

Each of two hot-air balloons acquires a charge of 3 × 10^-5 C on its surface as it travels through the air. How far apart are the balloons if the electrostatic force between them is 8.1x 10^-2 N?

Particle A has a charge of 44.5 nC, and particle B has a charge of -49.3 nc. The attractive force between them has a magnitude of 3.30 x 10-4 N. How far apart are the particles?