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:

When Lucas rubs the plastic ruler on his sweater, it gains an electric charge through friction. This charged ruler then exerts an electric force on the neutral pieces of shredded paper. The electric force can attract the paper because it induces a separation of charges in the paper (polarization), creating an attractive interaction. Tension force is related to pulling in a string - like object, normal force is the force perpendicular to a surface, and magnetic force is related to magnets. Since this is a charge - induced attraction, it is an electric force.

Answer:

D. electric force