sorry guys,
I just wrote in MS word and paste in the editor.I didn't notice ? in the problem.
some special characters are missing and I am giving errata
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
(A) B(w R2 /2)
(B) B(w
R2 /4) (C) B w (2 R2 -
R2 /4) (D) zero