Aring placed along y 2 + z 2 = 4, x = 0 carries a uniform charge of 5 μ c/m. ( a ) find d at p(3,0,0) . ( b ) if two identical point charges q are placed at (0, - 3,0) and (0,3,0) in addition to the ring, find the value of q such that d = 0 at p.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg