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According to Faraday's Law, the change rate of the magnetic flux \(\phi = BA\) built through a coil, represented by a
rectangular frame, above, yields an electromotive force \(\xi = I d\phi/dt\) (expressed in Volts). A is the cross sectional area of
the frame of concern \((LxI)\); B is the magnitude of the magnetic field vector perpendicular to A. The short (left hand
side) arm of length l of the above frame, is mobile. B is directed outward, and it bears an intensity of 6 Tesla. It is constant
all over, but the surface area A, changes with respect time. Thereby \(\phi\) changes with respect time, given that the side of
length l=30 cm, moves with a velocity v=50 cm/s, in between two parallel rails. The velocity v, then, is the same as the
change in L of the longer arm of the frame, per unit period of time. What is \(\xi\)?
a. 0.9V
b. 6V
c. 1.5V
d. 0.6V