Question

What is motional emf?

Answer 1

Motional EMF:

1. The induced emf in a conducting rod even though it travels inside a magnetic field zone is called emotional emf.
2. Whenever a conducting rods move in a magnetic field, possibly demonstrating translational motion or rotatory motion, a potential difference would be created at the rod's endpoints. Along the length of the rod, an electric field appears that is directed from the potentially high end towards the low potential ending. This EMF is known as Motional EMF.

Mathematically, motional EMF can be represented as:

$\mathrm{E}=\mathrm{vBl}$

Here,

B is the magnetic field.

l is the length of the rod.

v is the velocity of the rod perpendicular to the length of the rod.

Motional emf depends on:

1. The magnitude of length of the rod.
2. The velocity of the rod.
3. Magnetic field.