Question

gina is brushing her hair with a hard plastic comb. as she runs the comb through her hair, her hair becomes positively charged, and the comb becomes negatively charged. after a while, ginas hair becomes attracted to the comb and will move toward it even before the comb touches her hair. this happens because a. negatively charged objects attract other negatively charged objects. b. negatively charged objects attract positively charged objects. c. negatively charged objects are unable to touch positively charged objects.

Explanation:

To solve this, we recall the basic principle of electric charges: opposite charges attract each other, and like charges repel. The comb is negatively charged, and the hair is positively charged.

• Option A is incorrect because negatively charged objects repel other negatively charged objects (like charges repel).
• Option B is correct as negatively charged (comb) and positively charged (hair) objects are opposite charges and attract each other.
• Option C is incorrect as there's no such rule; charged objects can touch, and the attraction here is due to charge interaction, not an inability to touch.

Answer:

B. negatively charged objects attract positively charged objects.