Question 1

The image shows the electric field lines for a pair of point charges. Which statement best describes the nature and arrangement of these charges?

Accepted Answer

The left charge is positive and the right charge is negative, forming an electric dipole.

Question 2

Based on the electric field lines shown in the image, at which location would the electric field magnitude be the greatest?

Accepted Answer

At a point very close to either charge.

Question 3

If a test charge is placed at the origin (0,0), what is the direction of the net electric field at that point?

Accepted Answer

To the right, towards the negative charge.

Question 4

Which of the following best describes the electric potential at the origin (0,0) compared to points near the positive and negative charges?

Accepted Answer

The electric potential at the origin is higher than near the negative charge.

Question 5

If the magnitude of both charges in the image is doubled, what happens to the electric field at the origin?

Accepted Answer

The electric field at the origin quadruples.

Question 6

Suppose the distance between the two charges is increased while keeping their magnitudes constant. What happens to the electric field at the origin?

Accepted Answer

The electric field at the origin decreases.

Question 7

Which equation correctly represents the electric field at a point on the axis between two equal and opposite point charges separated by distance $$2a$$?

Accepted Answer

$$E = \frac{kq}{(x-a)^2$} - \frac{kq}{(x+a)^2$}$$

Question 8

If a negative test charge is placed at the origin, what is the direction of the force it experiences?

Accepted Answer

To the left, towards the positive charge.

Question 9

Which of the following statements about the electric field lines in the image is correct?

Accepted Answer

Electric field lines originate from the positive charge and terminate at the negative charge.

Question 10

If the charges in the image are replaced with two positive charges of equal magnitude, how would the electric field lines change?

Accepted Answer

The field lines would originate from both charges and curve away from each other.

Electric Field Magnitude Ranking for a Dipole

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