Question

four spheres with positive and negative charges hang from strings. which illustration correctly shows how the sphere will behave? a b c d

Explanation:

The core rule is that like charges repel each other, and opposite charges attract each other:

1. The first two positive spheres repel, so they should move apart.
2. The positive sphere and the negative sphere attract, so they should move toward each other.
3. The negative sphere and the last positive sphere attract, so they should move toward each other.
4. The first and last positive spheres are far apart, so their repulsion is negligible compared to adjacent charges.

Option B matches these behaviors: the first positive sphere moves left away from the second positive sphere; the second positive sphere moves toward the negative sphere; the last positive sphere moves toward the negative sphere.

Answer:

B. [Illustration B: + sphere at left moves away from middle +, + and - spheres move toward each other, right + moves toward -]