Verification of faraday’s law of electromagmetic induction

Experimental Report 4
VERIFICATION OF FARADAY’S LAW OF ELECTROMAGMETIC INDUCTION
Class : ICT-K55
Group : 06
Name : PHẠM THỊ THU THỦY
Verification of the instructors
EXPERIMENT MOTIVATION
The purpose of this activity is to measure the voltage across a coil of wire when a bar magnet moves through the coil of wire. 
Compare the voltage to the number of turns of wire in the coil.
II. EXPERIMENTAL RESULT
1. Measurement Results
Data table
Voltage peak 1
Voltage peak 2
150 wpg
1200 wdg
150 wpg
1200 wpg
South
1
0,037
0,670
-0,103
-1,210
2
0,038
0,709
-0,109
-1,258
3
0,040
0,685
-0,115
-1,206
North
1
-0,057
-0,380
0,079
0,550
2
-0,060
-0,396
0,082
0,548
3
-0,056
-0,378
0,080
0,540
N - S
1
-0,036
-0,630
0,108
0,315
2
-0,051
-0,656
	 0,106
0,320
3
-0,048
-0,638
0,102
0,309
N - N
1
-0,110
-0,890
0,202
1,458
2
-0,109
-0,930
0,196
1,525
3
-0,115
-0,880
0,190
1,433
S - S
1
0,110
0,920
-0,228
-1,660
2
0,106
0,860
-0,252
-1,547
3
0,107
0,879
-0,257
-1,680
Pig 1: the voltage of two peak at south – south case
Question 1: how dose the voltage of the second peak compare to the first peak?
The voltage of the second peak is greater than the voltage of the first. : there are two peaks: one for when you push the magnet in and one for when you pull the magnet out.
They are opposite in direction because of Faraday's law which states that the induced voltage throughout the wire induces a current that creates a magnetic flux in the direction opposing the change in flux.
So as we push the north end of the magnet in, the induced field should point out; as you pull the magnet out, the field should point in.
Question 2: for each run, how does the magnitude (amount) of the voltage of the second peak compare to the magnitude ( amount) of the voltage of first ? Explain why you think this happens.
Table of average of this voltage
Voltage peak 1
Voltage peak 2
150 wgp
1200 wgp
150 wgp
1200 wgp
north
-0,057 0,001
-0,384 0,001
0,080 0,001
0,546 0,001
south
0,038 0,001
0,688 0,001
-0,109 0,001
-1,224 0,001
N-S
-0,045 0,001
-0,641 0,001
0,105 0,001
0,314 0,001
N-N
-0,111 0,001
-0,900 0,001
0,196 0,001
1,472 0,001
S-S
0,107 0,001
0,886 0,001
-0,245 0,001
-1,629 0,001
We can see that the magnitude of the second peaks is greater than the magnitude of the first parts. You can see in this table.
Explain: 
when we release the magnet through the coil. The motion of the magnet is free fall, so we have the first velocity(when North pole through the coil) is small than the second velocity(when South pole through the coil). Because of this, the magnetic field through the coil is change, so the magnitude of the voltage also changes.
The magnitude of the voltage of two peaks: because the motion of the magnitude is the free fall. So the first peak, we have the motion is less than the second peak .
So the magnetic field will be change when drop the magnetic in the coil is increasing.
We can see the maximum voltage of peak 1 greater than be the peak 2.
Question 4 : we can see the above table show the maximum of peak 1 and 
peak 2 
Peak1
peak 2
150 wgp
150 wgp
north
-0,057 0,001
0,080 0,001
south
0,038 0,001
-0,109 0,001
N-S
-0,045 0,001
0,105 0,001
N-N
-0,111 0,001
0,196 0,001
S-S
0,107 0,001
-0,245 0,001
And 
Peak 1
Peak2
1200 wgp
1200 wgp
north
-0,384 0,001
0,546 0,001
south
0,688 0,001
-1,224 0,001
N-S
-0,641 0,001
0,314 0,001
N-N
-0,900 0,001
1,472 0,001
S-S
0,886 0,001
-1,629 0,001
In this case the maximum voltage of peak 1 is less than peak 2
Question 5:
The phenomenon is happen exactly what we predicted.