Which statement correctly describes these electric field lines?

a.
both sources are positively charged.
b.
both sources are negatively charged.
c.
source a is negatively charged and source b is positively charged.
d.
source a is positively charged and source b is negatively charged.

A.  Both sources are positively charged.

Explanation:

Before answering, let's remind what is the direction of the electric field lines for a positive charge and a negative charge. Keeping in mind that the direction of the field lines is given by the direction of motion of a positive test charged place in that electric field, we have:

- For a positive charge, field lines point away from the charge (because a positive test charge will move away from the source of the field)

- For a negative charge, field lines point towards the charge (because a negative test charged will move towards the source of the field)

In this example, we see that field lines point away from both charges A and B. therefore, both sources are positively charged.

c. magnitude and direction