Physics - Magnetism Question with Solution | TestHub

A$\mathrm{U}$-shaped conducting frame is fixed in space. A conducting rod$\mathrm{CD}$lies at rest on the smooth frame as shown. The frame is in a uniform magnetic field$B_0,$which is perpendicular to the plane of the frame. At the time$t=0$, the magnitude of the magnetic field begins to change with time t as,$B=\frac{B_0}{1+kt},$where k is a positive constant. For no current to be ever induced in the frame, the speed with which rod should be pulled starting from time$t=0$is (the rod CD should be moved such that its velocity must lie in the plane of frame and perpendicular to rod$\mathrm{CD}$)