JG Chapter 16 - Magnetism AI Flashcards
How does a compass work?
A compass has a freely moving needle that is a magnet. The North Pole of the needle is attracted to the South Pole of the Earth’s internal magnet, indicating direction.
What are magnetic materials?
Magnetic materials are attracted by magnets and can be magnetized themselves.
What are hard magnetic materials?
Hard magnetic materials are difficult to demagnetize once magnetized. Examples include steel, used for permanent magnets, compass needles, and large speaker magnets.
What are soft magnetic materials?
Soft magnetic materials are easily magnetized and demagnetized. An example is soft iron, used as cores for electromagnets.
What are non-magnetic materials?
Non-magnetic materials cannot be attracted by a magnet. Examples include plastic and rubber.
What is induced magnetism?
Induced magnetism occurs when a magnetic material becomes magnetized only in a magnetic field. For example, a nail near a magnet becomes magnetized but demagnetizes once the magnet is removed.
How can you demagnetize a magnet?
You can demagnetize a magnet by heating it or hitting it with a hammer.
What is a magnetic field?
A magnetic field is a region of space around a magnet or electric current where a magnetic pole experiences a force.
What do magnetic field lines indicate?
Field lines emerge from the North Pole and enter the South Pole. Closer lines indicate a stronger magnetic field.
How can you observe magnetic fields?
You can use the iron filling method by sprinkling iron filings around a magnet or the floating compass method by aligning compasses around a magnet.
What happens when two magnets interact?
Unlike poles attract (North to South), while like poles repel (North to North or South to South).
What is an electromagnet?
An electromagnet is a coil of wire that acts as a magnet when an electric current passes through it.
What is a solenoid?
A solenoid is a coil of wire that creates a magnetic field when electricity flows through it.
What happens to an electromagnet when the current is switched off?
The electromagnet loses its magnetic field, allowing it to be turned on and off.
How can you increase the strength of an electromagnet?
You can increase the strength by increasing the current, increasing the number of turns of wire, or adding a soft iron core.
What is an advantage of using an electromagnet?
The advantage is that it can be turned on and off.
