question

(a)derive an expression for induced emf developed when a coil of n turns, and area of cross -section, a is rotated at a constant angular speed  in uiform magnetic field b.

(b) a wheel with 100 metallic spokes each 0.5m long is rotated with speed of 120rev/min in a plane normal to the horizontal component of earth's magnetic field. if the resultant magnetic field at that plane is  and angle of dip at place is , find the emf induced between the axle and the rim of the wheel.

 

 

 

 

 

 

 

 

783