In an experiment, a rubbed balloon causes paper bits to rise toward the balloon. Which hypothesis is best supported by this interaction?

In an experiment, a rubbed balloon causes paper bits to rise toward the balloon. Which hypothesis is best supported by this interaction?

• A. The balloon has an electrostatic charge
• B. The balloon emits heat
• C. Air currents are responsible for the paper’s movement
• D. The room is filled with gas

Answer: (A)

Static electricity is what's being tested here. When you rub the balloon, electrons move onto the balloon, giving it a net negative charge. The paper pieces are neutral, but the charged balloon induces a charge separation in them so the side facing the balloon becomes attracted to it. The electrostatic attraction can pull the paper toward the balloon, sometimes lifting it upward against gravity. This shows how charged objects can exert a force on nearby matter without touching. Heat, air currents, or a gas-filled room don’t explain this specific interaction, so the electric charge explanation fits best.

Static electricity is what's being tested here. When you rub the balloon, electrons move onto the balloon, giving it a net negative charge. The paper pieces are neutral, but the charged balloon induces a charge separation in them so the side facing the balloon becomes attracted to it. The electrostatic attraction can pull the paper toward the balloon, sometimes lifting it upward against gravity. This shows how charged objects can exert a force on nearby matter without touching. Heat, air currents, or a gas-filled room don’t explain this specific interaction, so the electric charge explanation fits best.