1. Electric Field Lines

2. Rules
The lines begin on positive charges and terminate on negative charges.
(more lines, stronger E-field) The number of lines drawn emerging from or terminating on a charge is proportional to the magnitude of the charge.

3. No two field-lines ever cross
No two field-lines ever cross. (Because the tangent to the field line represents the direction of the resultant force, only one line can be at every point.)
The line approaches the conducting surface perpendicularly.

4. Several electric field line patterns are shown in the diagrams below
Several electric field line patterns are shown in the diagrams below. Which of these patterns are incorrect?

6. Erin drew the following electric field lines for a configuration of two charges. What did Erin do wrong?

7. Consider the electric field lines shown in the diagram below
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a. +, +
b. -, -
c. +, -
d. -, +
e. insufficient info