Question

list three method of producing magnetic fields​

Answer 1

Magnetic Fields can be produced by:
1. Permanent Magnet (Bar Magnets,Horse Shoe type Magnets,etc.),
2. ElectroMagnet (Solenoid),
3. Earth's Magnetic Field. (It's believe earth's core contains molten Iron, that is responsible for its magnetic Effect)

Answer 2

In bar magnet inside the field lines pass from South to North.

Outside the magnet the field lines pass from north to south.