What is minimum-energy configuration for a system of n equal point charges placed on or inside a circle of radius r? because the charge on a conductor goes to the surface, you might think the n charges would arrange themselves (uniformly) around the circumference. show (to the contrary) that for n=12 it is better to place 11 on the circumference and one at the center. how about for n=11 (is the energy lower if you put all 11 around the circumference, or if you put 10 on the circumference and one at the center)? [hint: do it numerically - you'll need atleast 4 significant digits. express all energies as multiples of q2/4πϵ0r

Which of the following are guidelines to follow for obtaining accurate observations

How long will it take a car traveling of a constant speed of 45m/s to cover the distance of a 2.5km?

4.at 0 ºc, some amount of energy is required to change 1 kg of water from a solid into a liquid. if you had a 2 kg piece of ice, what effect would this have on the amount of thermal energy required to change the water from a solid to a liquid? it would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice. it would still require the same amount of energy to change solid water into liquid water because the entire piece of ice would still gain the same amount of energy in each case. it would require energy to be removed from the 2 kg piece of ice. the larger piece of ice already has more total energy than the smaller piece of ice, so energy must be removed for the ice to become liquid. it would require less energy to change solid water into liquid water because the energy would spread through the ice more quickly and the ice already has a larger total amount of energy because it is larger than a 1 kg piece of ice.