connected objects

. The open end of the tube was also sealed with a cork having a brass tube. On inverting the glass tube, suddenly he observed that guinea fell down faster than the feather. He repeated the experiment by removing air with the help of an air pump which was connected to the brass tube. He fo..

The iron object is connected to a more active metal either directly or through a wire. Fe acts as the cathode. The more reactive metal is the anode. It loses electrons and gradually disappears. Example: Fe can be connected to Mg, Zn or Al which are called the sacrific..

When the sphere is connected to a conducting wire it gets earthed and the electrons flow to the ground and the positive charge remains there due to the attractive force of the external charge. When the external conductor is removed, the positive charge remains in the sphere making it a po..

During thunderstorms, large amount of electrical charge separation takes place in the clouds. As a result, some regions of the cloud have overall positive charge, while others have overall negative charge. When this separation becomes sufficient, the air ionizes and becomes conducting. This results..

A force is often defined as a "push" or a "pull". There is nothing untrue with this statement, but does not really tell you much about a force. Instead of defining force, it substitutes an antonym. A physicist prefers to define a force in terms of what it does. Just what does a force do? Suppose yo..

Iron and steel (alloy of iron) are most easily protected by paint which provides a barrier between the metal and air/water. Moving parts on machines can be protected by a water repellent oil or grease layer. Covering the surface with enamel and lacquers is another method. Sacrificial Protection ..

It is a relation that connects focal length of a lens to radii of curvature of the two surfaces of the lens and refractive index of the material of the lens. The following assumptions are made for the derivation: The lens is thin, so that distances measured from the poles of its surfaces ..

>This 'rusting' can be prevented by connecting iron to a more reactive metal (e.g., zinc or magnesium). This is referred to as sacrificial protection or sacrificial corrosion, because the more reactive protecting metal is preferentially oxidised away, leaving the protected metal intact. I..

Ray optics is also called geometrical optics as it uses the geometry of straight-line paths (rays) to explain the optical phenomena. Ray optics, infact, is the limiting case of wave optics. This means for most practical purposes, we can ignore the deviation from straight-line path as postulated..