Explain what lightning is.

What is the electrostatic force between two +0.25 C charges that are 0.25 m apart? (Coulomb's constant is 9.0 10⁹ Nm²/C²)

Select one:

a.-9.0 10⁷ N

b.-9.0 10⁹ N

c.+9.0 10⁹ N

d.+9.0 10⁷ N

A charge Q acts on a test charge to build an electric field, E. The strength of the field is measured at 8 N/C at 40 cm away. What would the field strength be 80 cm away with a charge of 1/2 Q Explain.

Assuming you have a point charge in a powerful and constant electric field, what is the relationship between the electric field and the electric potential energy?

Select one:

a.

b.

c.

d.