Correct Option
The correct option isElectrostatic force
Explanation
The phenomenon described is based on frictional electricity or the triboelectric effect. When two suitable materials are rubbed together, electrons are transferred from one material to the other, causing them to acquire net static electric charges.
Detailed Analysis
- Electrostatic Force (Correct): When a plastic comb is rubbed against dry hair, electrons are transferred (typically from hair to the comb), giving the comb a net negative charge. When this charged comb is brought near small bits of paper, it induces a separation of charge within the paper molecules (polarization). The positive charges in the paper are attracted to the negative comb, creating a net attractive electrostatic force strong enough to overcome the weight of the paper.
- Magnetic Attraction (Incorrect): Magnetic attraction occurs between magnetic materials or moving electric charges (currents). A static charged comb does not generate a magnetic field to attract paper.
- Electromagnetic Induction (Incorrect): This phenomenon involves the generation of an electromotive force (EMF) across a conductor due to a changing magnetic field. It is unrelated to static charge interactions.
- Gravitational Attraction (Incorrect): While gravitational force exists between all masses, it is extremely weak compared to the electrostatic force in this context and cannot lift paper bits against the Earth's gravity.
Key Takeaway: Friction between specific materials generates static electric charge. A charged body can attract neutral objects (like paper bits) through the process of electrostatic induction and polarization.