JEE Advanced 2016 Paper 2 Physics Q14

Physics · Electromagnetic Induction

Problem

A rigid wire loop of square shape having side of length LL and resistance RR is moving along the xx-axis with a constant velocity v0v_0 in the plane of the paper. At t=0t=0, the right edge of the loop enters a region of length 3L3L where there is a uniform magnetic field B0B_0 into the plane of the paper, as shown in the figure. For sufficiently large v0v_0, the loop eventually crosses the region. Let xx be the location of the right edge of the loop. Let v(x)v(x), I(x)I(x) and F(x)F(x) represent the velocity of the loop, current in the loop, and force on the loop, respectively, as a function of xx. Counter-clockwise current is taken as positive. Which of the following schematic plot(s) is(are) correct? (Ignore gravity)

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