Electricity and Magnetism

Electric bells

Thermometers

Glass windows

Wooden chairs

A copper coin

An iron nail

A wooden pencil

A rubber eraser

Zone

Area

Field

Space

Geographical East

Geographical West

Geographical North

Geographical South

Magnetization

Electrification

Magnetic induction

Magnetic flux

Magnetic strength remains the same

The pieces become non-magnetic

The pole strength of each piece is halved

The polarity of the pieces is reversed

Straight lines from center to ends

Concentric circles around the poles

Magnetic field lines

Random directions

A line joining the North and South poles of the Earth.

A vertical plane passing through the magnetic axis of a freely suspended magnet.

The circle around the middle of the Earth where the dip is zero.

The path followed by a unit North pole around the Earth.

On the axial line of the magnet.

On the equatorial line of the magnet.

At the poles of the magnet.

In the center of the magnet.

Bismuth

Nickel

Cobalt

Gadolinium

$0^\circ$

$17^\circ$

$90^\circ$

$180^\circ$

Two-dimensional

Three-dimensional

One-dimensional

Non-dimensional

The field is zero

The field is uniform

The field is changing

The field is weak

Lower

Higher

The same

Zero

Length of the wire

Magnitude of the current

Color of the insulation

Atmospheric pressure

One end to the other end

The center to the opposite ends

The ends to the center

Clockwise around the bar

It is too expensive

It is a non-magnetic material

It has very high resistance

It melts easily

Magnetic saturation

Magnetic induction

Magnetic flux

Magnetic declination

Zero

Uniform and parallel to the axis

Decreases as we move towards the center

Circular around the axis

Lines starting from North and ending at South outside the magnet

Lines starting from South and ending at North outside the magnet

Straight lines parallel to the magnet's length everywhere

Random lines throughout space

It will not magnetize at all

It will become a permanent magnet and stay magnetic after the current stops

It will become 100 times stronger

It will melt the copper wire

Because it breaks easily

Because it only works when electricity is flowing

Because it is made of cheap materials

Because it only lasts for one day

It is always magnetic

It can be quickly turned on and off to send signals

It is made of wood

It requires no maintenance

Zero

Maximum

Minimum

Unpredictable

The iron rod cannot be easily inserted or removed.

The magnetic field becomes much stronger.

It provides insulation and allows for the core to be changed.

It stops the flow of current.

The battery runs out of power.

The armature moves away from the contact screw.

The electromagnet pushes the armature away.

The switch is automatically turned off.

Aluminum

Copper

Nichrome

Iron

Both coils are wound in the same direction (e.g., both clockwise).

The coils are wound in opposite directions to create opposite poles at the ends.

Only one limb is wound with wire; the other is left bare.

The wire is wound around the curve of the U only.

It would still be a strong magnet but only for copper.

It would have a very weak magnetic field, only that produced by the solenoid itself.

It would cause a short circuit in the battery.

The wood would become a permanent magnet.

It allows electricity to flow through it easily.

It is easily 'permeated' or penetrated by magnetic field lines.

It allows heat to pass through it quickly.

It is very hard and cannot be broken.

Chemical changes

Magnetic fields

Permanent magnets

Nuclear energy

Electricity

Magnetism

Sound energy

Light energy

Yes, wood is a good conductor

Yes, wood is magnetic

No, wood is not attracted by the electromagnet

No, wood is too heavy

The bell will keep ringing normally

The hammer will stay stuck against the gong

The battery will recharge

The gong will start rotating

Switch -> Gong -> Coils

Switch -> Coils -> Contact Screw -> Armature

Armature -> Hammer -> Gong -> Switch

Coils -> Switch -> Hammer -> Contact Screw

The movement of the armature away from the contact screw

The hammer hitting the gong

The switch being released by the user

The battery running out of chemicals

The bell will ring more slowly

The electromagnet will become stronger and the hammer will strike harder

The bell will change its pitch

The circuit will stay permanently broken

Steel is a poor conductor of electricity.

The steel becomes permanently magnetized and won't release the armature.

Steel is too flexible to hit the gong.

The steel would melt due to the magnetic field.

It would be too magnetic.

Its high inertia would significantly reduce the frequency of the ring.

It would conduct too much electricity and drain the battery.

It would prevent the electromagnet from working.

Switch $\rightarrow$ Gong $\rightarrow$ Hammer $\rightarrow$ Battery

Battery $\rightarrow$ Switch $\rightarrow$ Electromagnet $\rightarrow$ Contact Screw $\rightarrow$ Armature $\rightarrow$ Battery

Battery $\rightarrow$ Electromagnet $\rightarrow$ Gong $\rightarrow$ Switch $\rightarrow$ Battery

Switch $\rightarrow$ Armature $\rightarrow$ Hammer $\rightarrow$ Gong $\rightarrow$ Battery

A leather belt

A dry sponge

A nickel coin

A plastic toy

The conductor

The circuit

The insulation

The filament

Too heavy

Too brittle

Too expensive

Too soft

Plastic

Rubber

Graphite

Glass

Aluminum is a better conductor than copper

Aluminum is much lighter and cheaper than copper

Aluminum is a better insulator than copper

Aluminum does not conduct electricity at all

A material that allows current to flow easily

A material that is a good conductor

A material that opposes the flow of electric current

A material that generates its own electricity

Use a metal screwdriver to check a live socket

Always wear rubber-soled shoes when repairing circuits

Touch a wire first to see if it is hot

Use a wet cloth to clean an electric heater while it is on

Glass, Tap Water, Copper

Copper, Tap Water, Glass

Tap Water, Glass, Copper

Glass, Copper, Tap Water

The wood acts as an insulator, breaking the path to the earth.

The wood attracts the electricity away from his body.

The wood increases the voltage, making it safer.

The wood acts as a secondary battery.

Conductors have many free electrons; semiconductors have very few.

Conductors use ions to carry charge; semiconductors use electrons.

Semiconductors are better conductors than metals.

Semiconductors do not allow any current to flow at all.