The attached picture shows a rectanguar loop of
What is the direction of the magnetic force on the TOP part of the loop where the current is moving in +x direction
Whenever a current-carrying conductor/loop is placed in a magnetic field, it experiences a force which can be determined using Fleming's left-hand rule.
According to Fleming's left-hand rule,
Stretch the thumb, index finger, and middle finger of your left hand, perpendicular to each other such that the middle finger gives the direction of the current, the index finger gives the direction of the magnetic field and the thumb will indicate the direction of the force acting on the conductor
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