E & EM
What is the right hand rule?
When the thumb is facing in the direction of the current and the fingers are in the direction of the magnetic field and the wire
What are ferromagnetic materials?
The materials that can be magnetized are called ferromagnetic materials like iron, cobalt, and nickel.
Name Earth's magnetic field.
Magnetosphere
Natural magnetic material.
Lodestone or magnetite.
What is an insulator?
A material in which charged particles cannot move is called an electric insulator.
ex: glass, wood, air
What is a solenoid?
A coil of wire with electric current flowing through it giving it north and south magnetic poles and a magnetic field.
Which type of charged objects attract? Repel?
unlike charges attract each other, like charges repel each other.
Define magnetic potential energy.
Stored energy that is the result of interactions of magnetic poles in a magnetic field
How does the Earth create 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.
Name 3 good conductors of electric charges.
Silver, copper, sea water
What is an electric generator?
The generator that converts kinetic energy into electrical energy.
What happens when a bar magnet is cut in half?
The two parts act as two magnets each with north and south pole. They are weaker magnets than the original larger magnet.
What is the difference between a temporary and a permanent magnet?
Temporary magnets are those who simply act as magnets when within a strong magnetic field, and permanent magnets are ones that retain its magnetic properties for a long period of time.
How does a compass needle work?
The North pole of compass needle point to the south pole of the magnet.
What is induction?
Charging an object without touching it.
What is a Neutral object?
When an object has equal amounts of positive and negative charge
Identify variables that affect the strength of electric fields.
Define Electromagnetism.
A branch of physics that works with electromagnetic force that occurs between electrically charged particles
What do two unlike poles do when they are brought close to each other ?
They attract each other.
What is a magnetic domain?
There are regions where the north and south poles of atoms are all lined up in the same direction in different materials. These regions are called magnetic domains.
Why are electromagnets better than regular magnets?
They can be switched on and off by supply of current.
They can be made weaker or stronger by controlling the power supply.
What does it mean if an object has neutral charge?
If an object is neutral, that just means that it has an equal number of positively and negatively charged particles.
What is voltage?
Voltage is the electrical potential energy difference between two places on a circuit.
An electric generator converts _____ energy into _____ energy, and an electric motor converts _____ energy into _____ energy
Kinetic, electrical.
electrical, Kinetic.
What is Ohm’s law?
It states that the current passing through a conductor is proportional to the voltage over resistance.
I= V/R