Interlude: The Hardest Part of this Course Faraday’s Law We will do this twice, today in addition to in about a month (discovered Aug 29,1831) Today’s Objectives What we are trying to get a feel as long as : Concept Question: Loop in Uni as long as m Field Seeing the Unseen:

Interlude: The Hardest Part of this Course Faraday’s Law We will do this twice, today in addition to in about a month (discovered Aug 29,1831) Today’s Objectives What we are trying to get a feel as long as : Concept Question: Loop in Uni as long as m Field Seeing the Unseen: www.phwiki.com

Interlude: The Hardest Part of this Course Faraday’s Law We will do this twice, today in addition to in about a month (discovered Aug 29,1831) Today’s Objectives What we are trying to get a feel as long as : Concept Question: Loop in Uni as long as m Field Seeing the Unseen:

Green, Marilyn, Contributing Editor has reference to this Academic Journal, PHwiki organized this Journal Interlude: The Hardest Part of this Course Faraday’s Law We will do this twice, today in addition to in about a month (discovered Aug 29,1831) Today’s Objectives Introduce key concepts from electricity in addition to magnetism through discovery activities, experiments, concept questions, discussion, in addition to visualizations. Later in the course, we will return to the same concepts. Today we are just going to have some fun. What we are trying to get a feel as long as : You Tube Link: http://youtu.be/YywaJkGKOaY

Antonelli Institute PA www.phwiki.com

This Particular University is Related to this Particular Journal

Concept Question: Loop in Uni as long as m Field While a rectangular wire loop is pulled upward though a uni as long as m magnetic field B field penetrating its bottom half, as shown, there is a current in the loop. no current in the loop. I do not underst in addition to the concepts of current in addition to magnetic field. I underst in addition to the concepts of current in addition to magnetic field but am not sure of the answer. Demo: aluminum sleeve moving past fixed magnet, students do this at their tables Demo: we show the demo of magnet falling through plastic tube in addition to aluminum tube Seeing the Unseen: Faraday’s Law Applet Applet – Faraday’s law applet (with a magnet in addition to a coil): http://web.mit.edu/viz/EM/visualizations/faraday/faradaysLaw/faradayapp/faradayapp.htm Play with the application until you are familiar with all the features. In the Actions Menu: try both Manual in addition to Generator Mode. You can use the buttons at the bottom to start, pause in addition to reset the simulation. You can move the magnet in addition to the ring back in addition to as long as th using the mouse. Let each person in the group have a turn.

Seeing the Unseen: First Concept Flow Group Discussion Question What are some examples of flow of “something” through an area Examples of Flow Electric Current: Flow Of Charge Electric Current I: Charge Q flowing across area A in time t Current in addition to Magnetic Field Current produces a magnetic field as shown in figure

Magnetic Field of Bar Magnet (1) A magnet has two poles, North (N) in addition to South (S) (2) Magnetic field lines leave from N, end at S Seeing the Unseen: Magnetic Field Run the Applet on generator mode in addition to stop the magnet when it is near the ring Scroll down on the panel on the right in addition to click on Magnetic Field: Iron Filings Seeing the Magnetic Field: Iron Filings The iron filings represent the magnetic field present at the instant you stopped the magnet . The direction of the magnetic field is along the direction of the iron filings. Does the magnetic field intercept the area of the circular wire

Magnetic Flux Thru Wire Loop Flux is the Generalization of Flow Product of magnetic field in addition to area Discussion Question: Magnetic Flux in Ring The first graph on the right in the Applet shows a plots of the external magnetic flux in addition to total magnetic flux in the ring versus time. Briefly describe where the “external flux” (red plot) is coming from: that is, what kind of flux is this, what creates it, over what area is the flux being measured. More Discussion Questions About Magnetic Flux Describe different ways that you can change the external flux Explain how the total magnetic flux (blue plot) is related to the external magnetic flux (red plot).

Current in Ring The second graph on the right in the Applet shows a plot of the current in the ring versus time. Proposing a Hypothesis Propose a qualitative relationship between magnetic flux (seen in top graph) in addition to current that flows in the ring (seen in bottom graph). Testing Hypotheses Groups utilizing the application came up with the following hypotheses. Group A conjectured that the current through the ring is proportional to the total magnetic flux. Group B proposed that the current through the ring is proportional to the change in the total magnetic flux. Use the application to test these two hypotheses. Design in addition to run a virtual experiment that could rule out any of the hypotheses. Which did you rule out in addition to why

Faraday’s Law of Induction Changing magnetic flux induces a current Electromotive Force Electromotive as long as ce looks like a voltage difference. It’s a “driving as long as ce” as long as induced current Faraday’s Law of Induction Changing magnetic flux is proportional to electromotive as long as ce

Demo: Electromagnetic Induction Demo: Electromagnetic Induction Demonstration: Induction At this point, students again move the coil of wire in their experiment just to observe the current

Green, Marilyn TravelAge West Contributing Editor www.phwiki.com

Concept Question: Loop in Uni as long as m Field While a rectangular wire loop is pulled upward though a uni as long as m magnetic field B field penetrating its bottom half, as shown, there is a current in the loop. no current in the loop. I do not underst in addition to the concepts of current in addition to magnetic field. I underst in addition to the concepts of current in addition to magnetic field but am not sure of the answer. Concept Question Answer: Loop in Uni as long as m Field Answer: 1. The motion changes the magnetic flux through the loop. The magnetic flux is decreasing in time as more of the loop enters a region of zero magnetic field. According to Faraday’s Law there is an induced current through the loop. Concept Question: Loop in Uni as long as m Field While a rectangular wire loop is pulled sideways though a uni as long as m magnetic field B field penetrating its bottom half, as shown, there is a current in the loop. no current in the loop. I do not underst in addition to the concepts of current in addition to magnetic field. I underst in addition to the concepts of current in addition to magnetic field but am not sure of the answer.

Concept Question Answer: Loop in Uni as long as m Field Answer: 2. The motion does not change the magnetic flux through the loop. The magnetic flux is constant in time. According to Faraday’s Law there is no induced current through the loop. Concept Test: Induced Current We define positive current clockwise as viewed from the top. As the coil moves from well below the magnet to well above that magnet, the induced current through the coil will look like: (1) (2) (3) (4) (5) I don’t know Try to answer this question using your experimental set-up Concept Question: Induced Current Answer Solution (3).

Conclusion: Faraday’s Law of Induction Changing magnetic flux generates electromotive as long as ce that opposes that change in flux Jumping Ring An aluminum ring jumps into the air when the solenoid beneath it is energized What is Going On This is a dramatic example of Lenz’s Law: When the magnetic field created when the solenoid is energized tries to permeate the conducting aluminum ring, currents are induced in the ring to try to keep this from happening!

Green, Marilyn Contributing Editor

Green, Marilyn is from United States and they belong to TravelAge West and they are from  Los Angeles, United States got related to this Particular Journal. and Green, Marilyn deal with the subjects like Cruise Lines; Travel

Journal Ratings by Antonelli Institute

This Particular Journal got reviewed and rated by Antonelli Institute and short form of this particular Institution is PA and gave this Journal an Excellent Rating.