Question

carga dos globos frotándolos contra tu cabello o contra la lana y sosténlos de los nudos. aproxima los globos. ¿qué dice tu observación sobre las cargas eléctricas de los globos?
a. tienen cargas opuestas porque se repelen.
b. no tienen carga porque no se atraen.
c. tienen cargas positivas porque afectan el movimiento del otro.
d. tienen cargas iguales porque se repelen.

Explanation:

When two objects are rubbed (in this case, balloons against hair or wool), they can acquire electric charges. The law of electric charges states that like charges repel each other and opposite charges attract each other. Since the two balloons are rubbed in the same way (against hair or wool), they will acquire the same type of charge. When they are brought close, if they repel, it means they have the same charge.

• Option A: Incorrect. Opposite charges attract, not repel.
• Option B: Incorrect. The balloons are charged (by rubbing), and non - charged objects don't show such repulsion behavior.
• Option C: Incorrect. Just because they affect each other's movement (repel) doesn't mean the charge is positive. Also, the key is the nature of the charge (same or opposite), not the sign (positive or negative) based on this simple observation.
• Option D: Correct. They have the same charge (acquired by the same rubbing process) and repel each other.

Answer:

D. Tienen cargas iguales porque se repelen.