**Goal:** Relate representations

**Source:** 283-342 Graph Ex(x)

We have a charge configuration

(shown at the right). Which graph is the plot of E_{x}(x), the

**x component** of the electric field, **as you move along the
x-axis?**

**Goal:** Relate representations

**Source:** 283-342 Graph Ex(x)

(shown at the right). Which graph is the plot of E_{x}(x), the

**x component** of the electric field, **as you move along the
x-axis?**

## Commentary:

## Answer

(6) Students should recognize that the field goes singular at the

charges. The only graphs doing that, #1 and #4, are eliminated because

the x-component of the field must be negative everywhere between the two

charges. Have students sketch the graph.