Electricity and Magnetism

Front

A balloon is rubbed all over with wool. The balloon will now attract wool because the balloon and wool

Back

have opposite charges

Front

In a static discharge, which particles move from one object to another? Options: protons, neutrons, electrons, atoms

Back

electrons

Front

Which of the following could be used as the core of a simple electromagnet? Options: drinking straw, iron nail, a soda bottle, an ink pen

Back

iron nail

Front

A piece of nickel will be attracted to

Back

either pole of an electromagnet

Front

What is voltage?

Back

a measure of potential energy difference

Front

Which of these is an insulator? Options: a copper wire, a silver spoon, a plastic coating on a wire, an aluminum coating on a wire

Back

a plastic coating on a wire

Front

What is the purpose of a switch in an electric circuit? Options: to allow the circuit to be opened or closed, to change the direction of the current, to provide a push for the current, to increase the electric power to the load

Back

to allow the circuit to be opened or closed

Front

What is the purpose of an electric motor?

Back

to convert electrical energy to mechanical energy

Front

Electric current flowing through a wire produces

Back

a magnetic field

Front

What is the purpose of an iron core in an electromagnet?

Back

to make the magnetic force stronger