Diamond is the hardest material according to the Mohs scale as it is ranked 10.Talc is the softest material as it is marked 1.(There are only 10 points!)
the force of magnet is magnetic force. it comes in the type of non-contact forces (forces applied by one body on another without in actual contact).
when light get diverge to normal in medium rarer to denser.then in conxex lens why all rays are meet at one point and it name is focus
Basically in physics a magnet electrically charged posses a energy form called electromagnetic energy. This one posses a hole and a particle when made. Obviously particle will go in the hole and this is why electricity is defined as flow of electrons. Electromagnet is a temporally charged one used in MRI's, robots, etc.
In the factories, Electromagnet is used to remove scrap iron from the waste. Electromagnet is fitted to a crane. When the operator switches it on by the electricity scrap iron is attracted towards the Electromagnet.