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1- A 4.7-µC point charge is located at x = 0.9 m, y = 3.1 m, and a -3.9-µC point charge is located at x = 2.1 m, y = -1.9 m.

(a) Find the magnitude and direction of the electric field at x = -2.7 m, y = 0.9 m. magnitude:

direction: °

(b) Find the magnitude and direction of the force on a proton at x = -2.7 m, y = 0.9 m. magnitude:

direction: °

2- An electron is released from rest in a weak electric field given by = -3.00 10-10 N/C . After the electron has traveled a vertical distance of 1.9 µm, what is its speed? (Do not neglect the gravitational force on the electron.)

3- A fixed point charge of +2q is connected by strings to point charges of +q and +4q. Find the tensions T1 and T2. (Use q, d and k as necessary.)

T1 =

T2 =