Victoria NewburyPhysics 134; MLHasbrouck 212Due Date: 4/24/14Using Oscilloscopes to Explore MagnetismAbstract.Magnetism is an important force that mediates the force between objects such as permanent magnets made of ferromagnetic materials. These play a role in our everyday lives. Magnetic flux is one way to measure the changes of magnetism in a given area with a certain amount of time. This can be useful to calculate.Questions & Answers:1. Define magnetic flux. What two quantities does magnetic flux depend on? (1 point)a. Magnetic flux is the product of the average magnetic field and surface area. Magnetic flux depends on it changing with time; otherwise there will not be an induced emf. It is also dependent upon the movement of the coil or magnet about each other. Magnetic flux is a part of Faraday’s law and significant for transformers and solenoids.2. Assume the frequency generator used had a fine adjustment range of 0.1-3. With the course adjustment being in powers of 10. What setting for the two frequency knobs on the function generator would give a signal with a frequency of 3000 Hz? (1 point)a. The setting for the two frequency knobs on the function generator that would givea signal with a frequency of 3000 Hz is a range of 1 kHz and a dial of 3. 1 kHz (1000 Hz) times a fine adjustment of 3 would give a frequency of 3000 Hz.3. On the Oscilloscope, what do the vertical and horizontal axes represent? Recall that each axis was divided into little boxes. There are 10 horizontal boxes, and 8 vertical boxes. IfTIME/DIV is set to 1 second, what is the minimum frequency of a waveform that could be fully displayed on the screen? (2 points)a. The vertical axes represents the volts and the horizontal axes represents the time. If TIME/DIV is set to 1 second, the minimum frequency of a waveform that couldbe fully displayed on the screen is .1 Hz (or cycles per second). I calculated this by first finding the period, 10 horizontal boxes times 1 seconds equals 10. Then I used the formula frequency = 1/period to calculate the frequency to be .1 Hz.4. If a scope has the Volts/DIV set to 2. What is the maximum signal voltage you can display? Assume the screen has 8 divisions. (1 point)a. The maximum signal voltage you can display is 4V. Since there are 8 divisions and the Volts/DIV is set to 2, the formula to calculate max signal voltage is 8 grid divisions divided by 2V = 4V.5. What were the maximum currents and voltages you were able to induce with the permanent magnet? How long were they present for (estimate)? What affected the amplitude of the current and voltages? (2 points)a. The maximum currents able to be induced was 2e-6. The maximum voltage was .8 Volts for amplitude. The frequency signal from the frequency counter was 300 Hz. This only lasted for a few seconds. The amplitude of the current and voltages was affected by the side that the magnet entered the center of the coil as well as which way the direction (north or south end of the magnet) was pointing.6. In part 4.3.3 (Induction between two Coils) there is no magnetic like previous part 4.3.2 (Magnetic and Coil), but there is an induced voltage (emf) in the second coil as measuredby the Oscilloscope. Where does the changing magnet flux that induces the voltage come from? How is the magnetic flux propagated to the second coil? (1 point)a. The changing magnetic flux that induces the voltage comes from the fact that there is a time varying current in the coil. This produces the time varying magnetic flux through the coil. The magnetic flux is propagated to the second coilfrom the terminals connecting the coils. The function generator applies the time varying voltage and the oscilloscope measures it.7. Plot the voltage amplitude vs frequency for your data taken with the two coils. What can you say about the relation between the two? Why might you expect this? (3 points)200 400 600 800 1000 1200 140000.050.10.150.20.250.3Amplitude vs. Frequency (Hz)voltage amplitude (Hz) 300 500 700 900 1100 1300frequency 0.08 0.12 0.16 0.2 0.24 0.28a. The relationship between amplitude and frequency are that they are directly proportional. I determined that they were directly proportional by looking at the slope of the graph of amplitude vs. frequency. This is to be expected because as the frequency increases, it is going to produce higher voltages and therefore a higher amplitude.Conclusion:Oscilloscopes are useful tools for measuring induced emf by creating their own time varying voltage across the terminal of two coils. Amplitude and frequency play major roles in this
View Full Document
Unlocking...