Lab_12p - Physics 272Lab Lab 13: Faradays Effect and LC...

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Physics 272Lab Lab 13: Faraday’s Effect and LC Circuits Lab 12: Faraday’s Effect and LC Circuits Part 1) Faraday’s Law OBJECTIVES In this part of the lab you will Use Faraday’s law to predict the emf produced in a coil from a time-varying magnetic field Measure the emf produced in a coil for a time-varying magnetic field Faraday’s law states that a changing magnetic flux will produce an electric field. NC d ˆ E dl=- B ndA dt If you place a coil with appropriate orientation in the region of this changing magnetic field, the electric field will cause a voltage difference between the ends of the coil. In this lab you create a changing magnetic field by moving a bar magnet away from a coil, and measure the resulting potential difference (emf). Before you make the measurement, you will attempt to calculate what the emf will be. 1) Warm Up Problem Problem 1) The north pole of a bar magnet points toward a thin circular coil of wire containing 40 turns. The magnet is moved away from the coil, so that the flux through one turn inside the coil decreases by 0.3 T m 2 in 0.2 s. What is the average emf induced in the coil during this time interval? Viewed from the right side (opposite the bar magnet), does the induced current run clockwise or counterclockwise? Explain briefly. CHECKPOINT 1: Ask an instructor to check your work for credit. You may proceed while you wait to be checked off
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Physics 272Lab Lab 13: Faraday’s Effect and LC Circuits 2) Predicting the emf a) Take out the following items for this part of the lab 1 compass 1 bar magnet 1 ruler or meter stick 1 coil of 1600 turns 1 PASport voltage sensor b) Quickly determine and record the magnetic dipole moment of the bar magnet in your kit. If you do not remember how to do this see Lab 8, Section 3 (you can do this with a compass and a ruler). If you examine your 1600 turn coil you will notice that the inside and outside diameters of the coil are rather different. Hold the bar magnet so the end of the magnet is just outside the coil, as shown below. This will be the initial position. You need to calculate the approximate magnetic flux through one turn of the coil, due to the magnet at this location, and then find the total flux through all the turns of the coil. c) Determine the average area of one turn of the coil (read on for details). If you take the coil to be a square with internal width and height l and outside width and height L, then the average area is Coil Magnet
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Physics 272Lab Lab 13: Faraday’s Effect and LC Circuits 33 W -w A= 3 W-w Using a b W w W 2 w W 3 w 1 f = f x dx a-b 1 A = A x dx W-w 1 A = x dx W-w 1x A = W-w 3 W -w A = 3 W-w d)
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This note was uploaded on 04/23/2011 for the course PHYS 272 taught by Professor K during the Spring '07 term at Purdue University-West Lafayette.

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Lab_12p - Physics 272Lab Lab 13: Faradays Effect and LC...

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