Two charged particles q1 and q2 are a distance r apart with q2=5q1.compare the forces they exert on one another when f1 is the force q2 exerts on q1 and f2 is the force q1 exerts on q2

a)f2=-5f1
b)f2=5f1
c)f2=f1
d)f2=-f1

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