Static Electricity

In a neutral atom, the number of electrons is equal to the number of _______.

• Neutrons
• Orbits
• Protons
• subatomic particles

If two charges repel each other, the two charges must be

• positive and neutral

• positive and negative

• positive and neutral

• negative and negative

An object becomes charged when the atoms in the object gain or lose

• electrons
• protons
• neutrons
• all of the above

If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.

If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by

• friction.
• convection.
• induction.
• conduction.

Objects that have opposite charges

• are attracted to each other, and the force between the objects pulls them together.
• are attracted to each other, and the force between the objects pushes them apart.
• are repelled by each other, and the force between the objects pulls them together.
• are repelled by each other, and the force between the objects pushes them apart.  

Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• reduction
• induction
• conduction
• friction

When you pull a cotton sweater off your skin, electrons are transferred from the ​ (a)   (cotton, skin) to the ​ (b)   (cotton, skin). As a result, your body acquires a ​ (c)   (+ , -) charge and the cotton sweater acquires a ​ (d)   (+ , -) charge.

• skin
• cotton
• +
• -

The proterty of atom that provides different objects with different electrical properties.

• electron affinity

• atomic number

• atomic mass

• atomic number

What will happen to the atom of a material with high electron affinity?

• It will attract more electrons.

• It will lose more protons.

• It will give up easily its electrons.

• It will not accept electrons.