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 If B is the Flux density, l is the length and v be the velocity of the conductor, then induced EMF is given by

The formula for the induced EMF (electromotive force) in a conductor moving through a magnetic field is given by:

EMF = Blv

where

B is the magnetic flux density
l is the length of the conductor that is perpendicular to the magnetic field
v is the velocity of the conductor perpendicular to the magnetic field.

This formula is known as the "magnetic flux rule" or "Faraday's law of electromagnetic induction" and is a fundamental principle in electromagnetism. It describes the relationship between the motion of a conductor through a magnetic field and the induced voltage in the conductor, which can be used to generate electrical power in generators and other electrical devices.