three point charges lie on the same x-axis. charge 1 (-2.1 μC) is at the origin, charge 2 (+3.2 μC) is at x = 7.5 cm, and charge 3 (-1.8 μC) is at x = 11 cm. what are the direction and the magnitude of the total force exerted on charge 1.

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)