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Chapter 11 PS Bonus

Chapter 11 Physical Science Bonus ♥ Tessa Spolzino

QuestionAnswer
The ancient Greeks found _______ which baffled them with their strange ability to attract and hold iron pieces. Loadstones
Magnetic objects always have a _ and _ magnetic pole- they are magnetic dipoles. North, South
If you cut a magnet in half you will end up with____ ______ ________, each with a _____ and ______ magnetic ______ two smaller magnets north, south pole
Scientists have found that even when magnets are divided as many times as physically possible, each of the microscopic fragments have a north and south magnetic pole.
Even the molecular structures that form magnets exhibit a magnetic dipole
Magnetism is a field force
A magnetic field can be modeled using magnetic lines of force
Magnetic lines of force are modeled as ________ loops both within a magnetized object as well as in the space around it. continuous
The direction of the field line is determined by _________________________ if inserted into the field. the direction a tiny compass would point
Magnetic field lines point _______ from the north magnetic poles and toward _______ magnetic poles. away, south
The distance between field lines indicates the strength of the field at that point.
What is the Law of Magnetism? Like poles repel, opposites attract.
Magnets strongly attract ____________ ferromagnetic materials
Magnets are slighty attracted to ______________ paramagnetic
Large groups of magnetic dipoles automatically align in the same direction to form microscopic regions called___________ domains
n unmagnetized ferromagnetic materials the magnetic directions of the domains are oriented randomly, so their magnetic forces __________ cancel each other
When the external magnetic field is applied the domains align to form a____________ _____________ permanent magnet
Particle motion increases with temperature
The temperature at which a material will abruptly lose its ferromagnetic properties is the ______ ____________ which is ________ curie temperature 770 Celsius
Conventional electrical current flows in the opposite direction from electrons.
What is the Right Hand Rule of Magnetism? If you grasp a wire so your right thumb points in the direction of the flow of the convectional current, the magnetic lines of force caused by the current will point in the direction your fingers wrap around the wire.
What is a solenoid? A coil of wire that acts like a magnet.
A solenoid with a bar magnet inserted in the middle makes an ________. electromagnet
Electric current produces a ______________. magnetic field
What does a magnetic field produce? Electric Current
What happens when you increase the number of coils or the speed of motion? It increases the amount of current produced.
A magnetic field affects the motion of what? Electrical charges in a conductor.
When concentration of magnetic field lines near a conductor increases or decreases, a force is exerted on what? Electrons.
The highly mobile electrons move through the conductor creating what? current IF the conductor is a part of an electrical circuit
What happens if the magnetic field is unchanging? no current is produced.
A turbine is a machine that converts the energy of a moving fluid into what? Rotational Motion.
Motors are machines that convert electrical energy into what? Rotating Mechanical Motion.
Created by: tessa1hope on 2012-02-03



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