How a Comb Is Made into a Magnet

            A magnet is an object that attracts other objects. The process of making a comb into a magnet includes the following steps. First, small pieces of paper are randomly arranged on a table, and a plastic comb is briskly rubbed with a piece of wool so that it gains electrons. Next, negatively charged comb is held over the pieces of paper, and the comb is allowed to collect the pieces of paper. Finally the pieces of paper are thoroughly removed from the comb and, the steps 1 through 4 are repeated to verify results.

 

How Overheadprojector Is Used

An overheadprojector is a device that casts a transparency image on a screen . The process 

of using an overheadprojector includes the following steps . First , an OHP is placed on a table

poisoned several feet from a screen and plugged into an electrical socket . Next , 

a transparency  is placed face up on the plate glass surface of OHP ,and the switch i turned on . 

After this , the height of OHP is adjusted so that image is centered on the screen , and the focus 

knob is turned until projecting a clear image . finally , the transparency is replaced with the

 next transparency , and the sixth step is replaced .