Electromagnetic Induction Part 2

A 20‌cm long metallic rod is rotated with 210‌rpm about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant and uniform magnetic field 0.2T parallel to the axis exists everywhere. The emf developed between the centre and the ring is mV. (Take π=22∕7 )