A uniform meter rule of weight 100 N is pivoted at its center(50 cm mark). A 150 N weight is hanged at the 10 cm mark and a 250 N weight is hanged from the 70 cm mark. Draw the diagram of the arrangement and calculate (a) the total anti-clockwise torque about its center, (b) the total clockwise torque about the center, (c) the net torque on the ruler about its center, and (d) the distance from the center where a 100 N weight should be placed to keep the meter rule at equilibrium.