PHYS 101 Pre-Lab #4

PHYS 101 Pre-Lab #4 - 10/10/07 PHYS 101-20 Lab #4 Magnetic...

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10/10/07 PHYS 101-20 Lab #4 – Magnetic Fields and Lenz’s Law Objective : To manually prove theories brought forth in Lenz’s Law through usage of bar magnets and electromagnets. By altering the magnetic field near a loop of wire, it is possible to produce an electric current in the wire loop; however, the direction of the current is opposite to the direction of electron flow. Magnets have magnetic field lines associated with them which point from North to South. The strength of a magnetic field in an area, called the magnetic flux, is measured (in a qualitative sense) by the number of magnetic field lines in the area. The fundamental idea of the lab is Lenz’s Law. This law states that the current produced in a loop of wire is proportional to the change in the magnetic flux that goes through the loop. It can be said, then, that electricity and magnetism are variations of the same force. There are a few different ways to change the magnetic flux through a loop. A magnet can be moved in and out of the loop, the loop can be moved along the magnet,
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PHYS 101 Pre-Lab #4 - 10/10/07 PHYS 101-20 Lab #4 Magnetic...

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