1) Find the electrostatic potential V=? on all parts of a conducting circular disk of radius r given by the equation: V=270 R dR R2+2 2) In the study of a rigid motor the following integration occurs: 8 -J(J+1)h² Z, = √(2J+1)e 8² RT dJ Determine Z, = ? for constant temperature T, assuming h, I and k are constants. 3) In electrostatistics, E= 0 a²σ sin 28√(a²+x²-2ax cos 0) do where a,σ and are constants, x>a and a is independent of e. Show that E=5 a²σ EX