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Derive the expression for emf induced in...

Derive the expression for emf induced in a straight conductor moving perpendicular to a uniform magnetic field.

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To calculate the emf induced, suppose in a small time `Deltat`, the loop is moved out of magnetic field through a small distance `Deltax`.
`:.` Decrease in area of the loop
` = - l Delta x`
Decrease in magnetic flux lined with the loop
`d phi = - B l Delta x`
As induced emf,
`epsilon = - d phi // dt`
`:. epsilon = (B l Delta x)/(Delta t) = Blv`
i.e., `epsilon = Blv`
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