Question

A rice grain tied to a thread is attracted to a plastic comb that was just used to comb hair?

Answer 1

the rice grain attracts due to electrostatic force.
Like charges repels whereas unlike charges attracts

Answer 2

Answer:

Due to electrostatic charges.

Explanation:

While we comb our hair some electrostatic charges will be produced on the comb.so that when we bring the comb near the rice tied to a thread it gets attracted because comb has a charge and rice has no charge we know that unlike charges attract each other. this is what happens when you bring a charged comb near rice tied to a thread.