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**1. Homework Statement**

1) From the observation that there's an electrostatic attraction between object A and B, what's the most you can conclude about the electric charge on A and B?

2) A plastic sphere with a positive charge of 4.8E-19 C is held stationary in a gravitational field of strength 9.8m/s/s by an electric field of strength 1.2E5 N/C. What is the force of gravity of the sphere?

3)How did Benjamin Franklin define a negative charge?

4) Draw a diagram to show the lines of force around a small positive charge.

5) Point P is 3.0 cm away from a small object with a positive charge of magnitude 5.0 muC. What is the electric field strength at point P?

**2. Homework Equations**

F=QE

F=kQq/d^2

**3. The Attempt at a Solution**

1) One has to be positive and one has to be negative.

2) 1.2E5 N/C=Fg/4.8E-14 N

Fg=5.8E-14 N

3) He defined it as having more electrons than protons.

4)

5) QE=(kQq)/r^2

E=(kq)/r^2

E=[(9.0E9)(5.0E-6 C)]/(0.030m)^2

E= 5.0E7 N/C