Fields
What allows objects to exert forces without being in contact?
Fields allow some objects to exert forces on each other even when they are not in contact.
Which pole of a magnet attracts the north pole of another magnet?
The south pole of another magnet.
What are positive charges attracted to?
Negative charges.
What is one way to increase the strength of an electromagnet?
Increase the number of coils of wire around the core, increase the current, or use a ferromagnetic core.
Name a type of field besides gravitational.
Electromagnetic field or magnetic field.
Name two metals attracted by magnets.
Iron and nickel.
What are two types of electric charges?
Positive and negative charges.
Why does a coil of wire in a speaker move?
The coil moves due to the interaction between the magnetic field of the coil and the permanent magnet.
What is one example of a field?
Electric field.
How does the strength of a magnet change over distance?
The strength of a magnet decreases as the distance from the magnet increases.
How do electric charges interact with each other?
Like charges repel each other, while opposite charges attract.
What role does electricity play in electromagnets?
Electricity creates a magnetic field when it flows through a coil of wire.
What happens to the force between magnets as they come closer?
The force between two magnets increases as they come closer together.
What happens to a magnet's strength when heated?
The magnet's strength decreases when heated.
What is static electricity?
Static electricity is the accumulation of electric charge on the surface of objects.
Describe an application of electromagnets.
Electromagnets are used in electric motors, cranes to lift heavy metal objects, and in magnetic locks
Describe how an electric field is generated.
An electric field is generated by the presence of electric charges.
Describe how magnetic fields are used in everyday life.
Magnetic fields are used in devices like speakers, MRI machines, and compasses.
Explain the principle of conservation of charge.
The principle of conservation of charge states that charge cannot be created or destroyed; it can only be transferred from one object to another.
What happens if the electricity in a coilgun is left on?
The iron in the coil could overheat and possibly damage the device or reduce its effectiveness.