A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right at constant speed v is: 
Definitions:
Internal Acoustic Meatus
An opening in the temporal bone of the skull that transmits nerves for hearing and balance from the inner ear to the brain.
Temporal
Relates to the aspect of time or the timing of events, as well as to the temporal bone area adjacent to the temples on the human skull.
Sphenoid
A complex bone at the base of the skull, which contributes to the formation of the orbit, the nasal cavity, and several important foramina.
Occipital
Pertaining to the back part of the skull, primarily associated with the visual processing region of the brain.
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