JEE Main 9 April 2017 Paper Solved Paper

In an experiment to determine the period of a simple pendulum of length 1 m, it isattached to different spherical bobs of radii r1 and r2. The two spherical bobs haveuniform mass distribution. If the relative difference in the periods, is found to be 5×10−4s, the difference in radii, |r1−r2| is best given by :