PASCO SF-8616_8617 COILS SET - Manual (Page 13)

scientific 11
012-03800A
Experiment 3: Springing into Electromagnetic Induction
Introduction
In this lab an interesting arrangement will allow you to investigate some of the subtelties of
electromagnetic induction. The results will be qualitative, contrary to many of the labs you have
done recently!
Equipment Needed - Supplied
1. The PASCO Model SF-8616 Basic Coils Set
Equipment Needed - Not Supplied
1. Two small, relatively strong magnets
2. Two springs with low force constants
3. Several machine nuts
4. Two ring stands
5. Banana connecting leads for electrical connections
Procedure
1. Set up the two 400-turn coils, the magnets, springs and ring stands as shown in Figure 1. See
Figure 2 to see how the springs “attach” to the magnets.
Figure 1 Figure 2
2. Move the magnet in one coil upward and then release it so that it sets up simple harmonic
motion. Note the reaction of the second magnet. Can you arrive at an explanation as to why
this is happening?
3. PREDICTION 1: What will happen if you reverse the leads in one of the two coils and repeat
step 2? Try it to see if your prediction is accurate.
4. PREDICTION 2: What will happen if you were to use additional masses on one magnet,
thereby increasing its period of SHM? Try this by adding several machine nuts onto the
bottom of the magnet. Adjust the height of the ring stand as needed.
5. PREDICTION 3: What will happen if you were to use a
different spring on one magnet?
Try it.
6. PREDICTION 4: What will happen if you use a different
number of coils on one side?
Try it.
7. PREDICTION 5: What will happen if you insert another
coil into the circuit, as shown in Figure 3? Try it. Does it
make a difference if different coils are used? Try it.
8. PREDICTION 6: What will happen if you put a core into
the third coil that you used in step 6? Why? Try it.
Figure 3
Nut
Magnet
Spring