Motional EMF Class 12 Physics

Motional EMF :- When a conducting rod moves in a magnetic field as it cuts the magnetic
field lines then an emf is induced in the coil and that emf is called motional
emf .

→ When a rod moves in magnetic field , means the electrons of rod moves in the magnetic field and
that moving electrons (charge) experiences a magnetic force and electrons get shifted towards one
end of the rod , due to this movement of electron , +ve and -ve charges get develop on the ends of
the rod . Due to the separation of charges an electric field is induced and that electric field applies
force on the electron in the opposite direction of magnetic force . After some times when electric
force and magnetic force on the electron becomes equal then movement of electrons get stopped
and between the ends of wire a potential difference established , this potential difference is
Motional EMF .

Calculation of Motional EMF :-

 

 

here, E =  Motional emf  , B = Magnetic Field , l = Length of rod

 

Note:-  For more detaild explanation by M Anwar Sir, Watch this video.

 

motional emf class 12

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