Why does a comb attract bits of paper when it is rubbed against the hair ?

What type of charge does an ebonite rod acquire when it is rubbed with wool? What is the nature of charge acquired by wool?

Why does a sheet of paper fall slower than one that is crumpled into a ball?

Why does a ray of light bend when it travels from one medium into another ?

Why does micelle formation take place when soap is added to water? is a micelle formed in other solvents such as ethanol also?

Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?