Given, number of spokes = 10; length of each spoke = L; angular velocity = ω; angular field = B Therefore, emf induced between axle and rim is given as E=Blvavg=
Blv
2
=BL
rω
2
Now, here r=L ⇒E=
BL2ω
2
Thus, emf induced between the axle and rim of the wheel is