MAGNETIC BENEFITS

PROPERT IES OF MAGNET
1. Magnets attract objects of iron, cobalt and nickel.     2. The force of attraction of a magnet is greater at its poles than in the middle.     3. Like poles of two magnets repel each other.     4. Opposite poles of two magnets attracts each other.     5. If a bar magnet is suspended by a thread and if it is free to rotate, its South Pole will move towards     the North Pole of the earth and vice versa.
1. Magnetic lines of force start from the North Pole and end at the South Pole.     2. They are continuos through the body of magnet     3. Magnetic lines of force can pass through iron more easily than air.     4. Two magnetic lines of force can not intersect each other.     5. They tend to contract longitudinally.     6. They tend to expand laterally.
For latest information , free computer courses and high impact notes visit : www.citycollegiate.com
FERROMAGNETIC SUBSTANCES
Substances that behave like a magnet in the presence of a magnetic field are known as     Ferromagnetic Substances.     EXAMPLES: Iron, cobalt and nickel are ferromagnetic substances.
SOLENOID
Solenoid is a coil of wire. Solenoid is a coil wound on a cylindrical frame of iron or any material when an     electric current passes through the Solenoid, a magnetic field is produced around it. It has suitable    numbers of turns of wire.      Magnetic field of solenoids is given by
B = monI
Magnetic field inside the solenoid is very strong and uniform but it is very weak outside the solenoid. USES OF MAGNETUses for electromagnets includeparticle accelerators, electric motors, junkyard cranes, and magnetic resonance imaging machines. Some applications involve configurations more than a simple magnetic dipole; for example, quadrupole andsextupole magnets are used to focus particle beams.