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The given assembly made of conducting wire is rotated with a constant angular velocity w about a real axis AC as shown in figure. AD part of assembly is quarter circle of radius R and DB is straight and parallel to axis AC. The magnetic field B’ exists vertically upward parallel to axis AC .Find the potential difference between points A and B(only the magnitude).Options are <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

(A)    B’(w R²  /2)

(B)    B’(w∏ R²  /4)

(C)    B’ w (2 R²  − ∏ R²  /4)

(D)    zero