A wheel with 15 metallic spokes each 60 cm long is roated at 360 rpm in a plane normal to the horizontal component of earth's magnetic field. The angle of dip at that place `60^(@)`. If the e.m.f. induced between the rim of the wheel and the axle is 400 m mV, calculate horizontal component of earth's magnetic field at the place. How will the induced e.m.f. change. if number of spokes is increased ?

(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 ?

A wheel with 25 metallic spokes each 0.4m long is rotated with a speed of 150 rev//min in a plane normal to the horizontal components of earth's magnetic field H_B at a place. If H_E=0.4G at the place, what is the induced emf between the axle and the rim of the wheel?

A wheel with 10 metallic spokes each 1 m long is rotated with a speed of 60 "rev"/"min" in a plane normal to the horizontal component of earth's magnetic field H_E at a place. If H_E = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1 G= 10^(-4) T

A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth's magnetic field H_E at a place. If H_E 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1G =10^(-4)T.

A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth's magnetic field H_(E) at a place. If H_(E)=0.4G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1G=10^(-4)T .

A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth's magnetic field H_E at a place. If H_E = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1G= 10^(-4) T.

A wheel with 20 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth.s magnetic field H_E at a place. If H_g =0.4 G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1G= 10^(-4)T.