First slide
Motional EMF
Question

A frame CDEF is placed in a region where a magnetic field B  is present.  A rod of length one metre moves with constant velocity 20 m/s and strength of magnetic field is one tesla. The power spent in the process is (take R=0.2 Ω and all other wires and rod have zero resistance) 
 

Moderate
Solution

e=BlvR
Power=e2R
=B2l2v2R=l2l2×2020.2=4002=2000W=2KW

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