than before (i.e., negative), reverse the wires on the arm of the current balanc
ID: 1783697 • Letter: T
Question
than before (i.e., negative), reverse the wires on the arm of the current balance. The increase in mass with the current on is due to the magnetic field. Calculate the magnetic force (multiply mass by g). Procedure: Part 1: Force vs. Current 1. Set up the apparatus as it appears in figure 22-1 and figure 22-2 using the current loop numbered SF 42. The circuit consists of a power supply, an ammeter (DMM) and the wire loop all connected in series 5. Increase the current in one-amp increments until 5.0 amps is reached 2. Place the long magnet on the center of the balance panThe wire loop should be arranged so that it passes through the pole region of the magnet (i.e., the horizontal part of the wire is just below the top of the magnet). See Figure 22-3 below. for each step. Convert mass to force. Using Graphical Analysis plot magnetic force vs. current and then determine the best-fit line. Be sure and include (0,0) data point From the slope you will determine the magnetic field strength of your magnet. Part 2: Force vs. Length of Wire 6. For this part of the lab you will need to know the effective length of the wire loops They are as follows: Current direction SF 40 1.2 cm SF 37 2.2 cm SF 39 3.2 cm SF 38 4.2 cm SF 41 6.4 cm SF 42 8.4 cm B field direction Note that the numbers on the loops do not signify the length of the wire. Figure 22-3 (Red arrow direction is to front of magnet) . With no current flowing zero the balance. This is your zero magnetic force since there is no current flowing Insert the shortest wire segment (SF 40) into the holder. Measure the mass of the magnet holder and the magnets again and determine its weight. (It should be about the same as before Once the experiment starts, do not move the 7. Adjust the power supply until the DMM reads 2.0 amps. Determine the magnetic force. Repeat for all six (wire) loops. Plot magnetic force vs, wire length. Be sure and include (0,0) data point. From the slope you will determine the magnetie field of your magnet objects and wires away from the magnet These could affect the data. 4. Before plugging in the power supply, have your instructor check the circuit After it has been approved, plug in the power supply and adjust the dial until the DMM reads approximately 1.0 amps. Part 3: Force vs. Angle When the current is turned on, the magnet should be pushed downwards and the mass should increase. If the balance reads less 8. Plug the round Current Balance Accessory into the am of the current balance. Replace the long magnet assemblyExplanation / Answer
We consider only the horizontal part of wire because horizontal part will have more influence on the wweight when we place the wire on balance. On the other hand, vertical segments do not contribute much to the weight as height has no effect on the weight of the magnet. so reading on the balance will not be considerable. This is the reason why we only consider horizontal part of wire.
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