UMass Amherst PHYSICS 132  Lab 4 132 (3 pages)
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Lab 4 132
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 University of Massachusetts Amherst
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 Physics 132  Intro Physics II
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Magnetism Induction Physics 132 Thursdays 9 am ILC S110 Abstract In this experiment we looked at the basic properties of magnets and magnetism We did this by examining how electric currents can generate a magnetic field and how an electric field is generated by a magnetic field this was done using a small magnet and rod Magnetism is an important force that mediates the force between objects such as permanent magnets made of ferromagnetic materials Magnetic flux is one way to measure the changes of magnetism in a given area with a certain amount of time Questions Answers 1 Define magnetic flux in your own words What two quantities does magnetic flux depend on 1 point Magnetic flux is the product of the average magnetic field and the surface area Magnetic flux depends on its change over time and the movement of the coil and magnent in relation to each other 2 Consider The magnet flux through a coil of wire with area A 100 cm2 and n 160 turns If a magnetic field is increasing through the coil at a rate of 0 75 Tesla sec what is the induce emf around the coil 2 points Lenz s law relates emf V to the flux via V d BA dt or V change in BA change in time We know that B 75 T sec You are also told the coil has an area of 100 cm 2 and 160 turns so the total area is 160 100cm 2 1 6 m 2 So V A change in B change in time 1 6m 2 0 75 T s 1 2 Volts 3 Hold the magnet as steady as you can in the coil Is there an induce emf around the coil Why or why not 2 points As we move either the magnet or coil the reflection will change and thus emf is induced in the coil of wire whenever there is change in the magnetic flux The relationship between the direction of field direction of motion and magnitude of induced emf is E BAcos where the angle between the magnitude induction also known as B and the line perpendicular to area also known as A So as we kept the magnet as steady there will be an at least minimum emf in the coil 4 Assume the frequency generator used had a fine adjustment range of
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