draw the free body diagram and find the diameter of middle part of a dumbbell if stress in middle portion is limited to 150N/mm2. the dumbbell is subjected to a tensile of load of 160kN

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v