16. The magnetic field B at the center of the rotating disk (point P in Fig. 2)
617b8db529843.jpg
(A) 617b8c19c2352.jpg
(B) 617b8c352e673.jpg
(C)617b8c501c2c5.jpg
(D)617b8c6b8529e.jpg
(E)none ofaboe

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