1) what is the reason behind covering wires carrying electricity
with rubber in some places ?
2) what procedure will u follow to study magnetic field, if you are provided with prafin oil , iron nail , bar magnet , battery , coil conductor wire?
3) which magnet will you choose among permanet magnet and electromagnet for Industrial purpose ? Justify your answer.
plz solve these questions
very urgent
Answers
1. Most electrical wire is covered in a rubber or plastic coating called insulation. ... The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
2. To study magnetic field , an electromagnet can be made using iron nal, wire and battery.
For making electromagnet, iron nailed is first coiled with wire and then the wire is connected to a battery. When any magnetic material is brought near the bar magnet, it will got attracted towards the magnet . While any non-magnetic material will not get attracted by it. Thus the effect of magnetic field can be studied that a magnet attracts magnetic material or objects. And bar magnet is a permanent magnet that will always attract magnetic material, unlike iron nail that required a battery connection to work as a magnet . So magnetic field can be studied by comparing magnetism created using two types of magnet that is permanent magnet that is bar magnet . And temporary magnet that is electromagnet .
3. Electromagnet is best for industrial purpose as it use magnetic attraction to lift heavy objects or magnetic separators that are responsible for sorting ferromagnetic metals from scrap metal.
Good Luck ;)