When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
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Solution
If the direction of magnetic field and flow of electric current are mutually perpendicular then force experienced by a current-carrying conductor in a magnetic field is largest. The direction of this force is given by the Fleming's left hand rule, which says that if the index finger points in the direction of magnetic field and the middle finger points in the direction of current then the thumb points in the direction of force.