A conducting bar moves as shown near a long wire carrying a constant 50-A current.If a = 4.0 mm,L = 50 cm,and v = 12 m/s,what is the potential difference,VA − VB? 
A) +15 mV
B) −15 mV
C) +20 mV
D) −20 mV
E) +10 mV
Correct Answer:
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