Two point charges of equal magnitude are 8.3 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of 45 N/C . Find the magnitude of the charges.

Express your answer using two significant figures.

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