TBR Electostatics/Electromagnatism Passage 1

[dray5150]

I'm having a real rough time with Passage 1 in the TBR PHYSICS Electrostatics. Could somebody explain the the concept of genereating emf from the rod... I got like 3/7 right

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[physics junkie]

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html has good explanations of all intro physics topics if no one step in to help you.