What is the difference between a short bar magnet and a long bar magnet ? How is the magnetic field passing through circular loop similar to short bar magnet? And if a number of circular loops are connected to diff sources of current but attached together , do they form a solenoid ? Or are the same rules of circular loop magnetic field applied on them ? I know that current in loop produces magnetic field in center ,but there is also magnetic field on the horizontal plane , that makes 2 mag fields , is there a net mag field ? And how is tis simlar to a bar magnet ? If a bar manet was like this , won't this leave it having 4 poles ? Please I am in desperate need of help !