Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?

The duration of a photographic flash is related to an rc time constantly

No bc a lot of things r still theories n unproven

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.