1. The Question: A 10.0 g pith ball, carrying a charge of 1.52 μC hangs from a thread attached to a charged vertical wall carrying a surface charge density σ = 3.57 μC/m2. Find the angle that the thread makes with the vertical. 2. Relevant equations 3. My attempt: Tcosθ=mg Tsinθ=F Canceling tension (sinθ/cosθ)=tanθ=(F/mg) F=mgtanθ σ=2ε0E E=σ/2ε0=201694.9153 F=EQ=(201694.9153)(1.52E-6)=0.3065762712 F/mg= 0.0031283293 = tanθ tan-1(0.0031283293) = 0.17924 Is this the correct angle?