During The Experiment Magnets Are Dropped From Different Heights Through The Coil While This Happens A Voltage Probe Wi 1 (146.46 KiB) Viewed 41 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. • DHAQQX/ Potential -8.000 V Latga Time Potential 7311 07530 7312 07301 -4005 7338 0752 -4006 7314 67100 0001 7330 07554 --0046 7316 07396 7317 07300 7336 07357 7310 07138 0.000 7340 0739 0016 7341 07340 0000 7342 07341 7343 07342 7344 07343 7345 07344 7710 67346 7347 07340 7710 07147 7349 07348 7310 07350 7312 07361 7312 07163 73140713 7355 67164 791007355 7357 07156 7310 07367 0:00) 0106 124 0133 0140 0101 0176 186 4200 0246 730007358 0270 7340 07160 0296 02596 7362 07361 7000 67362 7364 07361 0337 THE 07364 0340 700 03360 0366 7257 710 Potential 0.000 V 13:0000370 04 - 1 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.
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+ uncertainty 40 Average+ uncertainty 35 Average+ uncertainty 30 Minimum Voltage Maximum Voltage on entry (V) on exit (V) -1.051 -0.9612 -0.9913 + -0.9677 -0.8954 -0.8411 ± -0.8230 -0.9238 -0.7726 ± -0.8295 -0.7674 -0.7209 1.034 1.013 1.151 + 0.9496 1.017 0.9399 ± 0.9496 0.8592 0.9044 ± 0.8818 0.8230 0.8146
Average+ uncertainty 25 Average uncertainty Check + V -0.7603 -0.7035 -0.6609 V ± t 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? 0.8140 0.7597 0.7519 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? Vmin 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 ±
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