Lab 8_FaradaysLaws_updated

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Dec 6, 2023

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PHYS 2 Lab Fall 2023 Summer Lab PHYS 2 LAb Lab 08: Magnetic Field and Faraday’s Law You will need to run a simulation to do the lab. Answer the following questions as you work through the lab. Write your answers in blue . (Note that we may miss your response if it does not stand out) Re-load the file in Word or PDF format in Canvas before the due date. Objective In this lab, you will (i) Investigate the properties of magnet and (ii) Use Faraday’s Law to predict the properties of induced emf in a coil. You will investigate the induced emf generated by a moving bar magnet and coil. You will: ● Move a bar magnet near one or two coils to make a light bulb light-up. ● View the magnetic-field lines. ● Use an Ammeter (current meter) to show the direction and magnitude of the induced current. ● View the magnetic field-lines. ● Observe how the compass needle deflection and the electron movement inside the coil change by changing the source of an electromagnet from DC to AC. Theory: In the previous lab, we did an experiment to show how the current flowing through a wire produces a magnetic field around it. In this lab, we will study how the changing magnetic fields produce electric fields, a phenomenon known as ‘ Magnetic Induction ’. Faraday’s Law:

PHYS 2 Lab Fall 2023 Summer Lab PHYS 2 LAb According to Faraday's Law of Induction, a changing magnetic flux, Ф , through a coil induces an EMF ( electromotive force -- a voltage ) given by: ε =− N ΔΦ Δt ………. (1) where Φ = ⃗ B. ⃗ A is the magnetic flux due to a magnetic field ( ⃗ B ) passing through the cross-sectional area (A) of the loop of a wire, ⃗ A is a vector perpendicular to the area of the loop. N is the number of turns (loops) of the wire in the coil. For this experiment, the area of the coil remains constant and as the coil passes into or out of the magnetic field, hence Eq. 1 can be re-written as; ε =− NA ΔB Δt … ……. (2) Lenz's law states that the current induced in a circuit (loop) due to a change in a magnetic field is directed to oppose the change in flux and to exert a mechanical force which opposes the motion. Simulation: Open Faraday’s Electromagnetic Lab https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html? simulation=faraday Please take a few minutes to become familiar with different tabs and select options present in the simulation. 1. Bar Magnet 1. Click on the ‘Bar Magnet’ Tab you should see a bar magnet and a compass on the screen. You should note that the color red refers to North- and white refers to South-poles of the magnetic. Place the compass at the North end of the bar magnet and observe which way the “red tip” of the compass points. Move the compass to the South end, and observe where the “red tip” of the compass points. Based on your observation, describe how the compass works: [2 Points] The compass works by the red tip always pointing to

PHYS 2 Lab Fall 2023 Summer Lab PHYS 2 LAb the south pole on the magnet. When moving the compass near the north pole on the magnet, the gray tip is attracted. All in all, a compass works by the “north” direction, or red tip always pointing to the magnetic south pole, even though we declared it the north pole since the compass points north. The compass works by the red tip always pointing to the south pole on the magnet. When moving the compass near the north pole on the magnet, the gray tip is attracted. All in all, a compass works by the “north” direction, or red tip always pointing to the magnetic south pole, even though we declared it the north pole since the compass points north.

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