A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizo
Channel: Doubtnut
Date: 2020-01-28

A thin homogeneous rod of mass m and length `l` is free to rotate in vertical plane about a horizontal axle pivoted at one end of the rod. A small ballof mass m and charge q is attached to the opposite end of this rod. The whole system is positioned in a horizontal electric field of magnitude `E=(mg)/(2q)`. The rod is released from, shown position from rest. What is the speed of ball when rod becomes vertical?