A rigid rod AB shown in figure has negligible mass. A force W1 of 20 N acts on end A. The rod is pivoted about O such that AO = 12 m and OB = 16 m. The force W2 at B which will keep the rod in equilibrium is
(a) 5 N
(b) 10 N
(c) 15 N
(d) 20 N
Correct option (c) 15 N
Explanation :
For rotational equilibrium :
