Draw a sketch of the situation in Figure 22.30 showing the direction of electrons carrying the current, and use RHR-1 to verify the direction of the force on the wire.
We can see that is out of the paper,role="math" localid="1654151197106" is from left to right, and the direction of force F on the wire is perpendicular to the plane, pointing upwards, using the RHR-l.
The directions of magnetic force, conventional current, and the magnetic field can be determined using the right-hand rule-1 (RHR-1). Any two of these quantities can be used to find the third physical quantity. Point your index finger in the direction of the charge's velocity (v), with your right hand (recall conventional current).
The magnetic field travels from left to right, exiting the pole and entering the pole, which corresponds to the direction in which the fingers point while employing RHR-l. The thumb points in the direction of the current carriers' velocity, which is the same as the direction of when it emerges from the paper and points toward you. Finally, the wire's vector of force is perpendicular to the palm, emerging from it and pointing upwards.
The diagram of RHR-I can be interpreted as follows,
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