The drawing shows three identical rods (A, B, and C) moving in different planes.

Question

The drawing shows three identical rods (A, B, and C) moving in different planes. A constant magnetic field of magnitude 4.50 T is directed along the +y axis. The length of each rod is L = 1.3 m, and the speeds are the same, vA = vB = vC = 2.6 m/s. For each rod, find the magnitude of the motional emf, and indicate which end (1 or 2) of the rod is positive. rod A V ---Select--- End 1 is positive. End 2 is positive. No emf in rod. rod B V ---Select--- End 1 is positive. End 2 is positive. No emf in rod. rod C V ---Select--- End 1 is positive. End 2 is positive. No emf in rod.

drawing:

http://www.chegg.com/homework-help/questions-and-answers/the-drawing-shows-three-identical-rods-a-b-and-c-moving-indifferent-planes-a-constant-magn-q364426

Explanation / Answer

A)

The emf is zero because the velocity of the rod is parallel to the direction of the magnetic field, so the charges experience no force.

B)

The emf is vBL

= (2.6 m/s)(4.50 T)(1.3 m)

= 15.21 V.

The positive end is end 2.

C)

The emf is zero because the magnetic force on each charge is directed perpendicular to the length of the rod.

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