During the experiment magnets are dropped from different heights through the coil. While this happens a voltage probe wi

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During The Experiment Magnets Are Dropped From Different Heights Through The Coil While This Happens A Voltage Probe Wi 1 (146.06 KiB) Viewed 38 times

During the experiment magnets are dropped from different heights through the coil. While this happens a voltage probe will measure how the voltage changes with time. The video below shows the magnet being dropped from three heights, 5 cm, 20 cm and 40 cm above a coil. Watch the video and then answer the questions. It is a good idea to increase the size of the video so that you can see the graph appearing on the screen as the magnets pass through the coil. Here is a screenshot of the voltage versus time graph for one of these drops. Potentiel -8.000 V Latga Time Potential 7331 07130 7312 07331 -4005 7333 07552 7314 67131 733003354 --0046 2010 7316 07196 7317 07136 7336 07337 7310 07130 7340 07539 2015 7741 07340 2010 7342 07341 GOOD 7343 07343 7344 07343 7345 07344 0079 7340 0.7346 0:00 7347 07340 0106 7710 07147 0124 7340 07340 0137 7310 67340 0140 790167150 0161 7312 07361 0176 7313 07163 0.186 0316 730407353 7355 07164 7000 6700 1367 02356 7310 6716 0252 730007358 0270 7300 0719 0296 0216 0310 701 07360 7362 07361 7000 470 0300 0337 0340 7364 07363 7300 67164 7300 07365 0366 07168 0372 Potential 0.000 V 00 0 3:0000370 ►ÙA®¤ƒƒ½ Ma L 1 -0000-0000 eatoe LimPouம் Urcited Tre 30 On this screenshot if you zoom in you may be able to see the area under the curve for the time while the voltage was negative is given by -0.03475 Vs, the area under the curve while voltage is positive is 0.03516 Vs, the minimum voltage was -1.194 V at 0.7164 s and the maximum voltage was 1.464 V at 0.7492 s.
Faraday's law can be written as: &=-NPB This can be re-arranged to give: Edt = - Nd&B. Remember that the EMF, &, is the voltage. In the questions below it is useful to think about integrating this expression over the relevant time periods. 1. According to Faraday's law, what is the magnitude of the total area under ONE SIDE of the graph? Here, one side means the part of the curve that is either the magnet entering or leaving (as a hint: they both should be the same!). (To get the symbol in the box, type Phi) 2. Over the course of the magnet's fall, what will be the TOTAL change in flux through the coils? Here, consider both the magnitude and the sign of the area under both sides of the graph. 3. Which of the following variables is the size of the peak (i.e. the highest magnitude voltage on the graph) proportional to? □ Velocity O Number of Turns □ Orientation of Magnet 4. In these experimental results, the second peak has a larger magnitude than the first peak - why? (No answer given) (No answer given) They should be the same, it is experimental error The magnet slows down through the coil due to Lens' Law The magnet exits the coil faster than it entered, due to gravity. The magnet has a stronger magnetic field upon exiting the coil due to Faraday's Law.
Results from dropping the same magnet multiple times from different heights through a coil with 400 turns are presented in the table below. Fill in the missing values in the table. Drop height (cm) Velocity (m/s) 50 Average t uncertainty 40 Average t uncertainty 35 Average uncertainty 30 Average+ uncertainty 25 Average t uncertainty Minimum Voltage Maximum Voltage on entry (V) on exit (V) -1.367 -1.250 -1.289 # -1.258 -1.164 -1.094 ± -1.070 -1.201 -1.005 ± -1.079 -0.9979 -0.9374 ± -0.9887 -0.9148 -0.8593 ± 1.344 1.317 1.497 + 1.235 1.323 1.222 H 1.235 1.117 1.176 |± H 1.147 1.070 1.059 H 1.058 0.9878 0.9778 ±
If the same magnet was dropped through a coil with 800 turns from a height of 50 cm what minimum voltage would you expect to measure as the magnet enteres the coil? V Vmin= If the same magnet was dropped through a coil with 200 turns from a height of 50 cm what minimum voltage would you expect to measure as the magnet enters the coil? If a magnet with half the strength was dropped through a coil with 400 turns from a height of 50 cm what minimum voltage would you expect to measure as the magnet enters the coil? Vmin