Magnets & Electricity Flashcards
What is a magnetic force?
The force that a magnet exerts on certain materials, including other magnets, is called magnetic force (non-contact Force)
Where is the magnetic force strongest?
At the poles of the magnet.
What direction do magnetic field lines face between magnetic objects?
Magnetic field lines are closed curves leaving from North pole and entering the South pole when you follow them on the outside the magnet.
Which poles of magnets attract? Repel?
The opposite poles of magnet attract and same poles of a magnet repel each other.
Identify variables that affect the strength of magnetic fields.
The distance between the magnet and substance, the size of magnet, the strength of magnet.
How are field lines used to indicate the strength of magnetic fields?
The strength of the magnetic field is proportional to the closeness of the lines.
What happens when a bar magnet is cut in half?
It makes two magnets each with north and south pole.
What can a compass be used to detect?
A compass can detect a magnetic field and show its direction.
What is an example of a natural magnetic material?
Lodestone or magnetite.
Describe the attributes of a magnetic material vs. non-magnetic material in terms of magnetic domains.
The magnetic material has its magnetic domains facing in one direction. Whereas the domains in non-magnetic materials go any which way.
Explain how the Earth creates a magnetic field.
On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.
How do electric charges interact?
The like electric charges repel each other whereas opposite electric charges attract each other.
How is the charge of an object determined?
The object with excess protons is positively charged. The object with excess electrons is negatively charged.
Describe what happens when a charged object is brought near a neutral object.
The presence of a charged object near a neutral conductor will force (or induce) electrons within the conductor to move. The movement of electrons leaves an imbalance of charge on opposite sides of the neutral conductor.
Which type of charged objects attract? Repel?
The opposite charged objects will attract each other. The objects with same charges will repel each other.
How is electric current produced using a magnet and a coil of wire?
Moving magnetic fields pull and push electrons. … Moving a magnet around a coil of wire, or moving a coil of wire around a magnet, pushes the electrons in the wire and creates an electrical current. Electricity generators essentially convert kinetic energy (the energy of motion) into electrical energy.
What direction do field lines face between charged objects?
The electric field lines, point in the direction that a positive test charge would accelerate if placed upon the line.
Identify variables that will change the strength of electromagnets.
the nature of the core material,
strength of the current passing through the core,
the number of turns of wire on the core and
the shape and size of the core.
Identify variables that affect the strength of electric fields.
Strength of the charge
Distance from the charge
What does it mean if an object has a neutral charge?
If an object is neutral, that just means that it has an equal number of positively and negatively charged particles
