Magnets produce magnetic fields that have a direction and magnitude denoted by 'H'. The strength of a magnet's field can be interrupted by materials like concrete slabs but not skin or paper. Magnetic flux represents the amount of magnetic field passing through a surface and is represented by 'B'. Electromagnets are created by wrapping insulated wire around iron and passing a current to magnetize the coil. The Earth has its own magnetic field generated by iron particles in its core, which causes a compass needle to point towards the North magnetic pole. Auroras occur when the Earth's magnetic field deflects charged particles from the Sun towards the magnetic poles.

2. MAGNET
Magnet produces magnetic field
A force pulls on ferromagnetic
material
Attracts and Repels other magnets

3. MAGNETIC FIELD
Magnetic influence of electric
current &magnetic material.
Direction & Magnitude
 denoted by ‘H’

4. What affects the strength of magnet?
 Material between magnet &
metal.
 Concrete slab interrupts field.
 Skin,paper do not.

5. MAGNETIC FLUX
Amount of magnetic field passing
through a surface
Represented by ‘B’
The SI unit is ‘weber’

6. ELECTROMAGNETS
Insulated wire around iron
Current magnetizes the coil

7. EARTH’S MAGNETIC FIELD
Iron particles around the earth.
Iron acts as coil.
North- South poles.

8. EARTH’S MAGNETIC FIELD

9. MAGNETIC COMPASS
To find direction
Two ends
 A coloured end points North
direction

10. MAGNETIC COMPASS

11. AURORA
Bright band of light
Deflected charged ions from
sun by the earth magnetic field
Protects Solar Wind

12. AURORA

13. AURORA

14. APPLICATIONS
Magnetic Levitation Train
Computer Disks, Video Tapes
Magnetic bed