Review the learning resources for this lesson before studying the case problem.

Step 2. Analyze
Analyze the case problem below.

PART 1: Faraday’s Law

Directions and Questions: 

1. Navigate to the Faraday’s Law simulation with PhET at:

https://phet.colorado.edu/sims/html/faradays-law/latest/faradays-law_en.html

1. Click on “Field Lines” to see the magnetic field around the magnet.  Draw a sketch of what you notice.

2. What happens as you move the north side of the magnet into the coil?

3. How does the Voltage change as you move the south side rather than the North?

4. What happens if you move the magnet into the coil very slowly vs. very quickly.  What relationship can you make between the motion of the magnet and the current produced?

5. Can you produce a current when the magnet goes up and down in the loops?

6. Next try two rings vs. four rings.  What relationship can you make between the number of loops and the current produced.

7. Lastly, try putting the magnet in the loops and click the magnet flip button.  What happens as you spin the magnet several times?

8. Look at the Voltage needle as you spin it multiple times.  What type of  current do you think it is producing?  AC or DC?

PART 2: Faraday’s Electromagnetic Lab

Directions and Questions: 

1. Navigate to the Faraday’s Law simulation with PhET at:

https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html?simulation=faraday

1. Analysis: Bar Magnet   

Select “Bar Magnet” in the top left corner.

1. Click on the magnetic compass and move around the bar magnet.

    Explain the orientation of the compass needle 

2. Click on “Flip Polarity” button on right menu

    Explain two changes this causes in the simulation 

 Magnetic field: _____________

 Magnetic compass: ____________

3. Click on “Show Field Meter” toggle on the right menu.  

2. Analysis: Pickup Coil    

Select “Pickup Coil” in the top left corner.

1.  Move the bar magnet left and right THROUGH the coil of wire.  Describe the orientation of the magnetic field compared to the coil when     the most current is generated.  

 You can toggle the indicator from the bulb to the voltage gauge.

     How does the number of loops affect the current flow: the greater the number of loops, the  _______ the current.  

3. Increase or decrease the Loop Area

5. Why is little to no current generated when the bar magnet is moved up and down?

3. Analysis: Electromagnet     

Select “Electromagnet” along the top.

1. The animation demonstrates Real Current; Conventional Current is the opposite direction.

2. Slowly reverse the battery polarity by sliding the switch on the battery from the right position to the left position.  Describe the electron flow and magnetic field ½ way and all the way to the left (fully reversed).  

½ way: 

electron flow: _________________________________________________________

magnetic field: ________________________________________________________

fully reversed: 

electron flow: _________________________________________________________

magnetic field: ________________________________________________________

4. Analysis: Transformer     

Select “Transformer” along the top.

1. Move the smaller, left, powered, primary coil close to or inside the larger, secondary coil.

Why is no current generated in the secondary coil?  

__________________________________________________________________________

2. Now toggle the Current Source from DC to AC.

__________________________________________

Describe the relationship between frequency and current flow (or voltage as from the voltage meter) in the secondary coil    

As frequency decreases  __________________________________________________

and as frequency increases ________________________________________________

Step 3. Respond
Write a 300-word summary of your lab and your reflections on it. 

Step 4. Share
To share your work, click on the “Reply” button under this post and paste your work into the “Message” box. Make sure to reference others’ intellectual property when necessary. All references should follow 7th Edition APA formatting. For further instructions, see the resource on the Himmelfarb Health Sciences Library: APA citation resource (N.B. references are excluded from word counts).

Step 5: Interact
To complete the activity, evaluate and categorize the work from one of your peers based on items A - D of this rubric. Provide a rationale for your grade and comments or suggestions for improvement. To post a reply, click “Reply” on a particular discussion, write your feedback, then click “Post to forum.” You can use the list below as an example:

Item A is  .…. because….  My suggestions for improvement are….
Item B is  .…. because….  My suggestions for improvement are….
Item C is  .…. because….  My suggestions for improvement are….
Item D is  .…. because….  My suggestions for improvement are….

OPTIONAL Step 6: Interact (10 minutes)

If you would like to, you can reply to your peers' posts in a respectful and professional manner. Ensure that your post engages your peers' ideas by including a reflection on their comments, sharing ideas of other potential difficulties and parties involved, or asking thought-provoking questions. If a peer comments on your posting, please reply. To post a reply, click “Reply” on a particular discussion, write your feedback and then click on “Post to forum.”

OPTIONAL Step 7: Interact (10 minutes)

If you would like to, you can reply to your peers' posts in a respectful and professional manner. Ensure that your post engages your peers' ideas by including a reflection on their comments, sharing ideas of other potential difficulties and parties involved, or asking thought-provoking questions. If a peer comments on your posting, please reply. To post a reply, click “Reply” on a particular discussion, write your feedback and then click on “Post to forum.”