Electric Forces

What will happen to an uncharged conducting sphere if brought in contact with a highly positive body?

• It will become polarized.

• It will remain uncharged.

• It will become positively charged.

• It will become negatively charged.

Which of the following is not correct about the atom?

• Its mass is concentrated in the nucleus.

• The atom is positively charged when there is an excess of protons.

• The atom is negatively charged when there is an excess of electrons.

• The atom is neutrally charged if there are more neutrons than protons in the nucleus.

Consider an electron moving in an electric field. The direction of its acceleration is...

• at 45^o with the field

• opposite the field direction

• the same direction as the field

• perpendicular to the field direction

A toddler slides down a plastic slide (made of polyethylene) in the playground while wearing cotton shorts. Which of the following will hold true?

• The toddler will gain protons while the slide will lose protons and have a negative charge.

• The toddler will gain electrons while the slide will lose electrons and have a positive charge.

• The toddler will lose electrons while the slide will gain electrons and have a negative charge.

• The toddler will lose protons while the slide will gain protons and have a positive charge.

Which of the following is not a component involved in Gauss's Law?

• electric field

• electric potential

• electric flux

• electric charge

What method of charging can explain a lightning strike?

• by friction

• by conduction

• by induction

What property of a material is used to determine charges when they are charged by friction?

What physical law is analogous to Coulomb's Law?

An electric field causes any charged particle in it to experience an electric force.

• True

• False

When a material does not permit an easy flow of electrons through it, this can be classified as...

• conductor

• insulator

• semiconductor

• superconductor