determine the x -component of the differential force df2 exerted on a small portion of the second rod, with length dy 2 and position y2 , by the first rod. (this requires integrating over differential portions of the first rod, parameterized by dy1 .) express your answer in terms of some or all of variables q , l , y2 , dy2 , a , and the electric constant ϵ0 .
