magnetism

• Magnetic force is the force exerted by a magnet or magnetic field on a magnetic object.
• A magnetic field is a region in space where a magnetic force can be detected.
• Magnetic materials are substances that can be magnetized and have the ability to attract or repel other magnetic materials.
• Magnetic induction is the process by which a material becomes magnetized when it is placed in a magnetic field.
• Electromagnetism is the branch of physics that deals with the interaction between electric currents and magnetic fields.
• The Earth has a magnetic field that extends from its core into space.
• A magnetic field is a region in space where a magnetic force can be detected.
• Magnetism is used in compasses to determine direction.
• Magnetic fields are created by moving electric charges or by magnetic materials.
• Magnetic fields have both magnitude and direction.
• The strength of a magnetic field is measured in units called teslas (T).
• Magnetic field lines represent the direction and strength of the magnetic field.
• Magnetic field lines always form closed loops.
• It is also known as magnetic flux density or magnetic field strength.
• The unit of magnetic induction is the tesla (T).
• Magnetic induction is a vector quantity, meaning it has both magnitude and direction.
• The direction of the magnetic induction is perpendicular to the magnetic field lines.
• Magnetic induction is directly proportional to the magnetic field strength.
• There are three main types of magnetic materials: ferromagnetic, paramagnetic, and diamagnetic.
• Ferromagnetic materials are strongly attracted to magnets and can retain their magnetization even after the external magnetic field is removed.
• Examples of ferromagnetic materials include iron, nickel, and cobalt.
• Paramagnetic materials are weakly attracted to magnets and lose their magnetization when the external magnetic field is removed.
• Examples of paramagnetic materials include aluminum, platinum, and oxygen.
• Magnetic force is a non-contact force, meaning it can act on objects without physically touching them.
• The strength of the magnetic force depends on the strength of the magnetic field and the distance between the magnet and the object.
• Like poles of magnets repel each other, while opposite poles attract each other.
• The magnetic force between two magnets decreases as the distance between them increases.
• Magnetic force can also act on moving charges, such as electrons in a wire, causing them to experience a force and move in a certain direction.
• Magnetic fields are created by moving electric charges or by magnetic materials.
• A current-carrying wire produces a magnetic field around it.
• The direction of the magnetic field around a current-carrying wire can be determined using the right-hand rule.
• The strength of a magnetic field produced by a current-carrying wire depends on the magnitude of the current and the distance from the wire.
• The magnetic field lines around a current-carrying wire form concentric circles that are perpendicular to the wire.
• Magnetic field lines never intersect each other.
• The direction of a magnetic field is indicated by the orientation of the field lines.
• Magnetic fields can be visualized using iron filings or a compass needle.
• Magnetic fields can exert forces on moving charges and other magnetic materials.
• The force experienced by a charged particle in a magnetic field is perpendicular to both the magnetic field and the velocity of the particle.
• The magnetic field of the Earth is generated by the movement of molten iron in its outer core.
• The Earth's magnetic field is not perfectly aligned with its rotational axis, resulting in a tilt of about 11 degrees.