Electromagnetic force and electricity review

Which of the following is an example of the electromagnetic force?

• the Earth rotating around the sun

• protons and neutrons being bound to a nucleus

• the radioactive decay of subatomic particles

• a current carrying wire

Which statement is supported by Coulomb's law?

• only the charge of one object affects the electromagnetic force between two objects

• only the charges of both objects affects the force between two objects

• The distance between to objects has no affect on the force between two objects

• the charge and distance between to charged objects both influence the electromagnetic force between the two objects

A transformer is a device used to increase or decrease the voltage through induction. Which fundamental force is responsible for this induction?

• Electromagnetic force

• weak force

• strong force

• gravitational force

When the distance between two charges is doubled, the magnitude of the electrostatic force between them

• also doubles

• remains the same

• becomes half of what it was

• becomes 1/4 of what is was

magnets have

• only one pole

• two poles

• made of iron

• made of nickel

how does a motor operate?

• changing the magnetic flux to change the voltage of the circuit

• electrical energy moving a charge through a loop in a magnetic field, causing the loop to spin

• rotating a magnet in order to generate electricity

• using physical work to push a charge through a loop, generating a uniform magnetic field

what set of item could be used together to create a circuit

• battery, paper clip and string

• battery, light bulb and aluminum foil

• battery, popsicle stick, and wire

• battery, metal nail, and paper

a circular loop of 5 turns of wire rotates in a magnetic field. How can you increase the current in the generator?

• reduce the area of the loops of wire

• increase the number of loops of wire

• use a smaller magnet

• decrease the speed of the spinning wire

A student adds a piece of unknown material into a simple circuit. The light does not turn on. What is the unkown material?

• semiconductor

• insulator

• conductor

• superconductor

Which has the highest electrical resistance value?

• conductors

• insulators

• semiconductors

• superconductors