# Conducting rod

A conducting rod of length

*l*whose one end is fixed is rotated about the axis passing through its fixed end and perpendicular to its length with constant angular velocity*ω*. Magnetic field (*B*) is perpendicular to the plane of the paper (Fig. 8).**Fig. 8**

emf induces across the ends of the rod

where

*v*= frequency (revolution per sec) and*T*= Time period.# Cycle wheel

A conducting wheel each spoke of length

*l*is rotating with angular velocity*ω*in a given magnetic field as shown in Fig. 9.

**Fig. 9**

Due to flux cutting each metal spoke becomes identical cell of emf
Hence, .

*e*(say), all such identical cells connected in parallel fashion*e*_{net}=*e*(emf of single cell). Let*N*be the number of spokes.Here

*e*_{net}∝*N*°, i.e.*,*total emf does not depends on number of spokes*N*.# Faraday copper disc generator

A metal disc can be assumed to the made of uncountable radial conductors. When metal disc rotates in transverse magnetic field these radial conductors cut away magnetic field lines and because of this flux cutting all becomes identical cells each of emf

*e*, where**Fig. 10**