Class Lecture Presentation #31
... • Both magnetic and electrostatic forces decrease as r2 . • Both forces depend on the product of “charges” (electrostatic) or “pole strengths” (magnetic). • Both exhibit “field lines” that indicate magnitude and direction of forces. • However, unlike an electrostatic charge, a magnet is always at le ...
... • Both magnetic and electrostatic forces decrease as r2 . • Both forces depend on the product of “charges” (electrostatic) or “pole strengths” (magnetic). • Both exhibit “field lines” that indicate magnitude and direction of forces. • However, unlike an electrostatic charge, a magnet is always at le ...
Magnetic field of magnets Interaction between magnetic poles: like
... The field lines around a wire are circular. Their direction can be worked out with the right-hand grip rule for straight wire. ...
... The field lines around a wire are circular. Their direction can be worked out with the right-hand grip rule for straight wire. ...
Electricity and Magnetism Webquest
... the pages you need to read. These links will appear blue. Answer each question with one or more complete sentences. 1. Read the link: The History of Electromagnets. A. What happens when an electric current passes through a wire? (2.5 Points) ...
... the pages you need to read. These links will appear blue. Answer each question with one or more complete sentences. 1. Read the link: The History of Electromagnets. A. What happens when an electric current passes through a wire? (2.5 Points) ...
Electricity Review Questions
... are wet or while you are standing in water. Never put objects other than a plug into an ...
... are wet or while you are standing in water. Never put objects other than a plug into an ...
Magnets and Magnetic Fields
... • Magnets get their name from a stone found 3000 years ago in Magnesia, which is now modern day Greece. This stone is called Iodestone and is composed of magnetite. • Some material can be made into permanent magnets – You can change any piece of iron, such as a nail, into a permanent magnet by stro ...
... • Magnets get their name from a stone found 3000 years ago in Magnesia, which is now modern day Greece. This stone is called Iodestone and is composed of magnetite. • Some material can be made into permanent magnets – You can change any piece of iron, such as a nail, into a permanent magnet by stro ...
HSC Physics - Motors and Generators Verbs
... pole is produced at that end. Electric motors use an input voltage to produce an electric current in a coil to make the coil rotate in the external magnetic field. However, as the rotor rotates, the coils of wire are cutting lines of flux. This produces what is known as back emf between the ends ...
... pole is produced at that end. Electric motors use an input voltage to produce an electric current in a coil to make the coil rotate in the external magnetic field. However, as the rotor rotates, the coils of wire are cutting lines of flux. This produces what is known as back emf between the ends ...
Magnetic field
... Electromagnetic devices are used to change electrical energy into mechanical energy. Examples of electromagnetic devices: electric motors, galvanometers, loud speakers. ...
... Electromagnetic devices are used to change electrical energy into mechanical energy. Examples of electromagnetic devices: electric motors, galvanometers, loud speakers. ...
Magnetism I. Magnetic Forces Magnetism and electrostatic attraction
... through a coil of wire can produce a voltage (and therefore an electric current) in a wire. This is called electromagnetic induction. Before this discovery, the only source of usable electric energy was batteries. The voltage produced depends on 1) the speed of the magnet’s motion, 2)the magnetic fi ...
... through a coil of wire can produce a voltage (and therefore an electric current) in a wire. This is called electromagnetic induction. Before this discovery, the only source of usable electric energy was batteries. The voltage produced depends on 1) the speed of the magnet’s motion, 2)the magnetic fi ...
MagLev_Exam_and_Key
... For each question choose the best possible answer for the multiple choice section. For free response questions be sure to ...
... For each question choose the best possible answer for the multiple choice section. For free response questions be sure to ...
Superconducting magnet
A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce greater magnetic fields than all but the strongest electromagnets and can be cheaper to operate because no energy is dissipated as heat in the windings. They are used in MRI machines in hospitals, and in scientific equipment such as NMR spectrometers, mass spectrometers and particle accelerators.