A metal disk of radius s rotates with angular velocity ? about a vertical axis through a uniform field B poiting Up. A circuit is made by connecting one end of the resistor to the axle and other end to the the sliding contant which touches the outer edge of the disk.The resistance of the resistor is R. Find the current in the resistor?

• A. B s 2 2 R
• B. B s 2 R
• C. B s 2 R 2
• D. None of these