Q. A rod of length rotates with a uniform angular velocity about an axis passing through its middle point but normal to its length in a uniform magnetic field of induction with its direction parallel to the axis of rotation. The induced emf between the two ends of the rods is-

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A

B

zero

C

D

Solution:

Length of the rod between the axis of rotation
and one end of the rod
Area swept out in one rotation

Angular velocity radian/sec
Frequency of revolution
Area swept out per second
Magnetic Induction
Rate of change of magnetic flux
Numerical value of induced
Numerical value of induced emf between the axis and the other end is also These two emf are in opposite directions. Hence, the potential difference between the two ends of the rod is zero.
Hence, the correct answer is option

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