Question

select the correct answer.
lucas rubs a plastic ruler on his sweater. he waves the ruler above a pile of shredded paper and notices that the pieces of paper get attracted to the ruler. which attractive force is responsible for this?
a. tension force
b. normal force
c. magnetic force
d. electric force

Explanation:

• Option A: Tension force is a pulling force in strings/ropes, not related to attracting paper.
• Option B: Normal force is a contact force perpendicular to a surface, not for attracting paper.
• Option C: Magnetic force acts on magnetic materials, paper is not magnetic.
• Option D: Rubbing the ruler causes static electricity (electric charge), and electric force between charged ruler and neutral paper (polarization) causes attraction.

Answer:

D. electric force