Dear vivek,
The direction of magnetic field around a current carrying conductor can be determined by using one of the laws given here.



Rule
Pictorial Representation


Right Hand Thumb Rule Imagine that you are  holding the conductor in your right hand with the fingers curled around  it. If the thumb points in the direction of the current, then the curled  fingers show the direction of the magnetic field.




Maxwell's Cork- Screw Rule Imagine a  right-handed corkscrew being rotated along the wire in the direction of  the current. The direction of rotation of the thumb gives the direction  of the magnetic lines of force.
 
 
 
 
 
 
 
 
















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