The Fascinating World Of Static Electricity And Electric Charges

The video explores static electricity, starting with everyday examples like doorknob shocks and balloon tricks. It explains the basics of electric charges, atoms, and the movement of electrons. The video covers conductors and insulators, and different methods of charging objects, including friction, contact, and induction. It introduces grounding and polarization, and explains Coulomb's Law for calculating electrostatic forces. The lesson concludes with a summary and a preview of the next topic on electric fields.

What principle explains the shock you feel from a doorknob?

• Magnetic fields

• Nuclear forces

• Static electricity

• Thermal conduction

What happens when two pieces of tape, both negatively charged, are brought close together?

• They stick to the table

• They repel each other

• They become neutral

• They attract each other

What are free electrons?

• Electrons that can move freely

• Protons that can move freely

• Electrons that are fixed in place

• Neutrons that can move freely

Which material is a good conductor of electricity?

• Wood

• Plastic

• Copper

• Glass

What is charging by friction?

• Transferring charge by touching

• Transferring charge by rubbing

• Transferring charge by induction

• Transferring charge by grounding

What does the law of conservation of electric charge state?

• Charge can be doubled

• Charge can be created

• Charge can be destroyed

• Charge can only move from one place to another

What is the value of the Coulomb's Law constant in air or vacuum?

• 1.6 x 10^-19 C

• 6.67 x 10^-11 N m²/kg²

• 9 x 10^9 N m²/C²

• 3 x 10^8 m/s

How does the force between two charges change if the distance between them is doubled?

• It doubles

• It halves

• It remains the same

• It becomes one-fourth

What is the charge of a single electron in Coulombs?

• -1.6 x 10^-19 C

• 9 x 10^9 C

• 1.6 x 10^-19 C

• 0 C

What will be the force between a proton and an electron 1 nanometer apart?

• 9 x 10^9 N, repulsive

• 0 N, neutral

• -2.3 x 10^-10 N, attractive

• 2.3 x 10^-10 N, repulsive