Magnetic takeoff

A thin charged loop with a charge q>0q>0 (uniformly distributed) and mass mm is placed on a ramp which forms and angle α=45\alpha= 45^{\circ} with the horizontal. Due to the presence of an external homogeneous magnetic field of magnitude BB directed into the page, the loop "takes off" after a time tt^{*}. Determine the time t t^{*} in seconds if qBm=1 s1. \frac{q B}{m}= 1~\mbox{s}^{-1}. Assume that the loop rolls without slipping while in contact with the ramp.

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