P. 4072. Two pointlike particles of charge Q are fixed at two of the vertices of an equilateral triangle of sides . At the third vertex a third particle of mass m and of charge q is released.
What is the initial acceleration of this particle, and with what speed does it pass one of the the points which is at a distance of 2 from both the fixed charges? How does the result change if the effect of the gravitational force is considered as well while the particle moves along a vertical line?
Data: =10 cm, m=10-3 g, Q=10-8 C, q=10-9 C.