Physics-14 Magnetism and Static Electricity Prequiz

What is a cylindrical coil of wire acting as a magnet when carrying electric current.

• solenoid

• neutral

• Coulomb

• protons

• magnetic field lines

Answer explanation

A solenoid is an electric conductor wound as a helix with small pitch, or as two or more coaxial helices, so that current through the conductor establishes a magnetic field within the conductor.

What is the SI unit of electric charge?

• solenoid

• neutral

• Coulomb

• protons

• magnetic field lines

Answer explanation

1. A Coulomb is the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.

What is a positively charged subatomic particle?

• solenoid

• neutral

• Coulomb

• proton

• magnetic field lines

Answer explanation

A proton is a positively charged subatomic particle. A proton is an elementary particle that is identical with the nucleus of the hydrogen atom, that along with neutrons is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673×10⁻²⁴ gram.

What are the invisible lines that map out the magnetic field around a magnet?

• electrical field

• neutral

• induced magnetism

• magnetic field

• magnetic field lines

Answer explanation

Magnetic field lines are a visual tool used to represent magnetic fields. They describe the direction of the magnetic force on a north monopole at any given position. The density of the lines indicates the magnitude of the field.

What is the influence of a magnetic field on iron, which makes the iron a temporary magnet?

• electrical field

• conventional current

• induced magnetism

• magnetic field

• magnetic field lines

Answer explanation

Induced magnetism is the process where any unmagnetised object gains temporary magnetic capabilities when it is put inside the magnetic field of any magnet.

_______ _____ flows from the positive side of the battery to the negative side. This is the way current is drawn in circuit diagrams, even though it is wrong.

• electrical field

• conventional current

• induced magnetism

• magnetic field

• magnetic field lines

Answer explanation

Conventional Current assumes that current flows out of the positive terminal, through the circuit and into the negative terminal of the source. This was the convention chosen during the discovery of electricity. Even though it is commonly used, it is wrong.

_____ _____ is an electric charge at rest; generally produced by friction or induction.

• electrical field

• static electricity

• electrical insulator

• electrostatic charge

• electrical conductor

Answer explanation

Static electricity is a stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.

_____ _____ is the space around a charged object in which another charged object experiences an electric force.

• electrical field

• static electricity

• electrical insulator

• electrostatic charge

• electrical conductor

Answer explanation

An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles. Electric fields originate from electric charges and time-varying electric currents. Electric fields and magnetic fields are both manifestations of the electromagnetic field, one of the four fundamental interactions (also called forces) of nature.

_____ _____ is a material through which electric charge can flow easily.

• electrical field

• static electricity

• electrical insulator

• electrostatic charge

• electrical conductor

Answer explanation

an electrical conductor is an object or type of material that allows the flow of charge (electric current) in one or more directions. Materials made of metal are common electrical conductors. Electric current is generated by the flow of negatively charged electrons, positively charged holes, and positive or negative ions in some cases.

_____ _____ is a material through which charge cannot flow easily.

• electrical field

• static electricity

• electrical insulator

• electrostatic charge

• electrical conductor

Answer explanation

An electrical insulator is a material in which electric current does not flow freely. The atoms of the insulator have tightly bound electrons which cannot readily move.