To keep the bar moving at a constant speed, the external force must exactly oppose the magnetic force's x-component.
While opposite poles are drawn to one another, the same poles repel one another. When you rub an iron object against a magnet, the north-seeking poles.
Moving things are subject to the force of friction, which acts in the opposite direction to the motion.
Using the right-hand rule, we may recall this diagram. If you move your pointer finger in the same motion as the positive charge.
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