Lab 7

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Oklahoma State University *

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3114

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Physics

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Jan 9, 2024

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docx

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Lab 7 Magnetic Induction Part I Magnetic flux Recall and write down the definition of magnetic flux, the angle is between magnetic field direction and 0 and 90 degrees. Write down the magnetic flux in each case use the symbol given in the diagram. If zero, please just write 0. a: 0 b: 90 c: 60 Open Friday’s law simulator Keep all as it is when you just opened the simulator, do not move anything. Is there any flux in the coil? No Is there any change in flux in the coil? No Now select Show Field Lines, check if your answer is correct. Now imagine that you are moving the magnet toward the coil. Is there flux in the coil? Yes Is there any change in flux in the coil? Yes Please state Lenz’s law here: The induced electric current that flows in a direction such that the current opposes the change that induced it.
Use the bottom wire, will there be any current according to Faraday’s law, if so, what will be the direction the current (left or right) on the bottom wire. Left Now move the magnet into the coil, check the direction of the current, if the current flow to the left, the needle should show negative direction and vice versa. Left, negative Now leave the magnet inside the coil, is there any current? Why not? No, the current balances out and there is no direction or movement Now pull magnet out (move towards right) of the coil, what happens to the current direction. The current turns right, positive Now move the magnet in and out with faster or slower speed, observe and describe the difference in the current. The faster the magnet is pulled in/out, the higher the current jump while the slower the magnet is pulled in/out, the slower the current jump will be. In this simulation, where did the electric energy come from or who is doing the work? The electric energy came from the magnet Part II Motional EMF Open the Motional EMF simulator Click play and observe. Suppose this purple force is a constant force applied by you on the conducting rod (red). The rod is on a frictionless conducting rail (Blue), the rail is connected to a resistor (green). Describe the motion of the rod with your constant force applied, describe what happens if you remove your (purple) force. When there is a constant force applied to the rod, it begins to accelerate. This causes a resistive force to pull on the rod which makes the rod reach a constant velocity. After the constant force is removed, the rod begins to slow down (negative acceleration) and eventually stops. If the purple force is removed, the rod stops. Reset and run the simulation again, as you begin to move the rod to the right, will there be any current in the resistor? If so, in what direction (clock or counter- clock)
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