In a vertical magnetic field of B induction, a conductor is moving perpendicullar on filed, with constant speed.
What electromotive voltage is induced in conductor?
The conductor is occupying the transverse area with radius R.
The induced electromotive voltage
The vectorial product vxB give the orientation to the induced electromotive voltage .
The active length l is obtained from Pitagora theorem:
Under sqrt, the factors sum is constant, =2R, and independent by t, then the product is maxim when the factors are equal:
t=R/v (meaning when the conductor passes through the circle center, that means that the active length is maxim)