Take Example 24.6 and consider that a portion of the disk with radius r + dr was cut and removed. Derive in detail and clear steps how we might calculate the V at point P.

Example 24.6

A uniformly charged disk has radius R and surface charge density a: (A) Find the electric potential at a point P along the perpendicular central axis of the disk. dA : 27H\" (fr dq = odA=o(2xr dr )=2nordr k dq k 2nor dr dV = Vr +x R 2r dr V= ko R -2+ x -2 r = Th . of ( 12 + x ) " 2r dr P X X 1/2 V = 2rko R+x -X dA = 2Tr dr dr(B) Find the x component of the electric eld at a point P along the perpendicular central axis of the disk. 5%