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Place ur right hand in ALL THE BEST position, this acts as a current carrying conductor if that happens then the way ur fingers wrap around the the thumb gives u the direction of the magnetic field lines.
similarly if the thumb is placed upside down the reverse happens 
AS ABOVE SAID place your right hand in such a way like in ALL THE BEST POSITION the thumb indicates the direction of current and the four fingers tat is wrapped up indicates the magnetic field lines.