I was doing some experiments with water drops on lampblack when I saw this. Inside a water drop which is perfectly still from the outside, you can see some moving things, which I suppose are some lampblack flakes from the surface. I am not bothered about how those flakes got in there, but I am...

How strong would the combined forces of electromagnetism on the earth and planets need to be, to mimic, and therefore, replace gravity?

In my school days ,I had been taught that we cannot move a vehicle by applying any force from inside.That is we cannot push the vehicle from inside. But when I was sitting in a scrolling chair, I could able to move it without touching anything other than the chair.can anyone explain the reason f...

When the positive and negative terminals of a battery is connected through a wire, an electric current flows across the circuit. Generally, electrons are the ones that flow (from negative terminal to positive terminal). What would happen when a conductor is connected only to the negative terminal...