When burning a fire, since there is only ash left in the end, so matter is destroyed. this proves that fire is one of the only ways the law of conservation of matter can be broken?

What is the scientific definition of energy that relates to work

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

What is the role of lenses in microscopy?