Conservation of Electric Charge

This video tutorial on AP Physics Essentials covers the conservation of electric charge. It includes simulations and experiments demonstrating charge transfer using a balloon, sweater, amber, wool, and pith ball. The video explains how charges are conserved in a system, the role of grounding in charge neutralization, and the behavior of charges in conductors and insulators. It concludes with a simulation involving an aluminum can and charged rods, emphasizing the movement and conservation of charges.

What happens when a balloon is rubbed on a sweater in terms of charge?

• It loses electrons and becomes positively charged.

• It gains electrons and becomes negatively charged.

• It loses protons and becomes negatively charged.

• It gains protons and becomes positively charged.

How can the total charge in a system be altered?

• By increasing the temperature of the system.

• By adding more charged objects.

• By grounding the system.

• By rubbing two neutral objects together.

What is the net charge of objects before and after rubbing amber on wool?

• The net charge is positive before and negative after.

• The net charge is negative before and positive after.

• The net charge is zero before and after.

• The net charge is positive before and remains positive after.

Why does a pith ball repel after being attracted to a charged amber?

• Because it becomes neutral.

• Because it loses all its charge.

• Because it gains a different charge than the amber.

• Because it gains a similar charge to the amber.

What happens to the electrons in a conductor when a charged glass rod is brought near?

• They are repelled by the rod.

• They remain stationary.

• They are attracted towards the rod.

• They move away from the rod.

How does a rubber rod with a negative charge affect a nearby conductor?

• It attracts electrons towards it.

• It repels electrons away from it.

• It has no effect on the conductor.

• It attracts protons towards it.

What is the principle of charge conservation in a system?

• The total charge depends on the number of objects.

• The total charge always becomes zero.

• The total charge remains constant.

• The total charge can increase or decrease.