Magnetism Flashcards
What is magnetic force?
Magnetic force is the attractive or repulsive force exerted by a magnet on magnetic materials.
Which materials do magnets exert force on
Magnets exert force on other magnets and magnetic materials.
What are magnetic materials, and give examples?
Magnetic materials, like iron, cobalt, and nickel, can be magnetized.
Define non-magnetic materials and provide examples
Non-magnetic materials, such as aluminum and copper, are not attracted to magnets.
Explain the difference between hard and soft magnets
Hard magnets, made from steel, are permanent, while soft magnets, like iron, are temporary and magnetized only when attached to another magnet.
What are magnetic poles, and how many poles does a magnet have?
The Magnetic poles are the two ends of a magnet. All magnets have a north pole (N) and a south pole (S).
Explain the properties of magnetic field lines.
Magnetic field lines are continuous, imaginary, three-dimensional, never cross or touch, and are more concentrated where the field strength is greatest (at the poles).
Explain why a compass needle points to the magnetic North Pole.
A freely rotating magnet/compass needle aligns with the Earth’s magnetic field, pointing towards the magnetic North Pole
Define the Angle of Declination and its significance.
The Angle of Declination is the angle between the direction a compass points and true north, indicating the deviation from true north.
How does the Earth act as a magnet?
The Earth has a magnetic field, behaving as if it contains a huge bar magnet with a North Pole and a South Pole.
Why doesn’t a compass always point toward true north on Earth?
The Earth’s magnetic poles are not in line with its north-south rotational axis,
What is the significance of the geographical North Pole in compass navigation?
The geographical North Pole is the location where the Earth’s axis meets its surface, providing a reference for true north in compass navigation.
What is the role of ferromagnetic materials in magnetism?
A compass needle aligns with the Earth’s magnetic field, pointing towards the magnetic North Pole and aiding navigation.
