A slidewire generator is made with a wire that makes good contct with conducting

Question

A slidewire generator is made with a wire that makes good contct with conducting rails as shown below. The rails are connected to a resistor. There is a uniform magnetic field into the page (-z direction) throughout the region of the apparatus. You pull the wire towards the right with a constant force, and the wire moves with a constant speed in the direction shown. What is the direction of the magnetic force on the slidewire?

The answer say -x direction. I have no idea why -x direction. Could you explain thoroughly?

Explanation / Answer

using left hand rule direction of ‚ magnetic force is in right direction

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