The balloon in this image was rubbed with a piece of wool material. Now, it is negatively charged. What force allows the charged balloon to "pick up" the small pieces of paper off of the table?

The negatively charged balloon is attracted to negative static charges in the paper..

The negatively charged balloon is attracted to the north pole of the paper pieces.

The negatively charged balloon is attracted to the south pole of the paper pieces.

The negatively charged balloon is attracted to the positive static charges in the paper.

What is the best explanation of electric current in a wire?

Electrons build up in the wire and create a charge.

Electrons flow because of electrical attraction and repulsion.

Protons are pushed along by electric forces.

Atoms move because of heat.

Why does the light bulb in a circuit turn on when you close the switch?

The switch absorbs the electrical energy.

The switch changes the direction of the flow of electrons.

Closing the switch completes the circuit, making it a closed circuit.

The switch changes the circuit from series to parallel.

Earth is dipolar, like a bar magnet.

What does this mean about its magnetic poles?

There is only a magnetic south pole.

There is only a magnetic north pole.

There are both magnetic north and south poles.

There are two magnetic north poles.

Which arrangement described below would result in magnetic poles that attract one another?

North Pole + South Pole

South Pole + West Pole

East Pole + North Pole

North Pole + North Pole

Why is an electromagnet a temporary magnet?

An electromagnet only attracts other permanent magnets.

An electromagnet becomes a magnet when a current flows through the wire. An electromagnet no longer acts as a magnet when the current flow stops.

An electromagnet cannot be turned on and off.

An electromagnet is a magnet when no current flows through the wire. The electromagnet no longer acts as a magnet when current flows through the wire.

What set of materials listed below could be used to create a complete electromagnet?

wires and battery

iron nail and battery

iron nail, magnet, and wire

battery, iron nail, copper wire

Where is a bar magnet's magnetic field the strongest?

red part of the magnet

longest part of the magnet

magnetic poles (N + S)

center of the magnet

A(n) is represented in the diagram it converts electrical energy into mechanical motion.

generator

electromagnet

parallel circuit

motor