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(a) A metallic rod of length l is moved ...

(a) A metallic rod of length l is moved perpendicular to its length with velocity v in a magnetic field `vec(B)` acting perpendicular to the plane in which rod moves. Derive the expression for the inducced emf.
(b) A wheel with 15 metallic spokes each 60 cm long, is rotated at 360 rev/min in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place is `60^(@)`. If the emf induced between rim of the wheel and the axle is 400 mV, calculate the horizontal component of earth's magnetic field at the place.
How will the induced emf change, if the number of spokes is increased ?

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