Question

list three method of producing magnetic fields?

Answer 1

Three methods of producing magnetic fields are as follows: (a) Magnetic field can be produced by placing a permanent magnet or a horse-shoe magnet at the place, where magnetic field is required. (b) Magnetic field is produced around a current carrying straight conductor or a current carrying coil.

Answer 2

methods are: 
1) passing electric current through a straight conductor/circuit
2) passing electric current through a circular loop
3) passing electric current through a solenoid