A metal sphere is hung by a string fixed to a wall. The forces acting on the sphere are shown in figure. Which of the following statements is NOT correct?

As the body is in equilibrium, so vector sum of all three forces N→, T   → and W→ should be zero. Hence (a) is correct. NowT sin θ = N ----(1)T cos θ = W -----(2)(l)+(2) ⇒ tan θ = NW⇒ N = W tan θ. Hence (d) is correct.Squaring and adding (1) and (2); T2 = N2+W2Hence (b) is correct.Hence (c) is incorrect.