Electrostatics intro

Insulators are different than conductors in that insulators ____.

• do not contain electrons or protons 
•  do not contain any charge
• have a weaker affinity for electrons 
• do not allow charge to freely move 

Consider the conduction charging shown. 

• Electrons move from the insulating stand into the sphere.
• Protons move from the bar into the sphere.
• Electrons move from the charged metal bar into the sphere.
• Protons move from the sphere into the negatively charged bar.

 A balloon is rubbed against a student's hair and then touched to a wall. The balloon sticks to the wall due to

• magnetic forces between the particles of the balloon and the particles of the wall
• electrostatic forces between the particles of the balloon and the particles of the wall
• magnetic forces between the particles of the wall
• electrostatic forces between the particles of the balloon

A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• must be positive
• must be negative
• may be neutral or negative
• may be neutral or positive 

When a plastic rod is rubbed with wool, the wool acquires a positive charge because

• protons are transferred from the wool to the rod
• protons are transferred from the rod to the wool
• electrons are transferred from the rod to the wool
• electrons are transferred from the wool to the rod

How can objects become electrified?

• By plugging them in to a socket
• Adding acid to them
• Rubbing with flannel
• Shaking them in the air

What is the name of the particle that is being transferred?

• Proton
• Neutron
• Electron
• Positron

Which of the following DOES NOT use electrostatics to work?

• Dryer sheets
• Electric Motor
• Photocopier
• Van de Graff Generator

What is the overall charge on this balloon? (They are the same so look at either one!)

• +3
• -6
• +6
• -3

What is the name of this device that is used to detect charges?

• beaker
• electroscope
• van de graff generator
• chargometer