Molecular Theory of Magnetism - Facts about Molecular Theory

The theory was first propounded by Weber in 1852 AD and was later developed by Ewing in 1890 AD. Due to this fact, it is also known as Weber Ewing theory. According to this theory, every magnetic substance contains a very tiny magnet called molecular magnet. In a magnetized piece of iron, molecules are present in all possible direction and form (closed chains) random orientation and the result is that one molecular magnet cancels

Measurement - Types and Importances

In our every day practice, the measurement is one of the most useful and important process. Wherever we go and whatever we do, we need measurement. Without measurement, we cannot get exactness in any unknown quantity. When you go to a tailor to get your shirt stitched, he takes your measurement and asks you to purchase the length of cloth you need. This is concerned with the measurement of length. When you go to a shop