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How can the direction of force on a current -carrying conductor ,kept in a magnetic field ,be changed ?

Ans : 

A current-carrying conductor experiences a force perpendicular to its length and the magnetic field. The direction of the force on the conductor depends upon the direction of current and the direction of the magnetic field. The direction of the current and that of the magnetic field perpendicular to each other and found that the force is perpendicular to both of them. The three directions can be found out through a simple rule, called Fleming’s left-hand rule. According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.