Experimental report 4: Verification of faraday’s law of electromagnetism induction môn Vật lý đại cương 2 | Học viện Công Nghệ Bưu Chính Viễn Thông

Experimental Report 4:
VERIFICATION OF FARADAY’S LAW OF ELECTROMAGNETISM INDUCTION Group: 04 Name: Nguyễn Nhật Minh Student ID: 20224347
I/ Experimental Motivations •
Verify Faraday’s law of electromagnetism induction II/ Experimental result 1/ 1200 turn coil: Pole Voltage peak 1 Voltage peak 2 North -0.318 0.514 South 0.304 -0.533 North-North -0.619 1.000 South-South 0.602 -1.000 North-South -0.084 0.121 .North .South .North-South .North-North .South-South 2/ 150 turn coil: Pole Voltage peak 1 Voltage peak 2 North -0.056 0.100 South 0.053 -0.110 North – South -0.083 0.159 North – North 0.076 -0.175 South - South -0.015 0.016 .North .South .North-South .North-North .South-South II. ANSWER QUESTIONS
Q1. Why does the value of first voltage peak 1 is smaller than that of the value of voltage peak 2?
Due to differences in the rate of change of the magnetic field,
Peak 1 indicates the immediate response when the magnet first
contacts the coil, while Peak 2 reflects a more significant change
as the magnet passes through the center of the coil. The faster
change in the magnetic field at this position leads to a greater
induced voltage, as the induced voltage is inversely proportional to the time deviation.
Vinduced=−N∆(BA) ∆t
Q2. Why are the signals of the induced voltage in case of N-pole and S-pole inverse with each other?
Lenz’s law: Lenz's law indicates that the direction of the induced
current (and therefore the induced voltage) will always be directed
in such a way that it creates a magnetic field that counteracts the
change in magnetic flux that causes it.
North Pole: When the north pole of the magnet enters the coil, the
magnetic flux increases. According to Lenz's rule, an induced
current will be generated in such a way that the magnetic field of
the coil will resist the increase in magnetic flux. As a result, the
induction voltage will have positive indication.
South Pole: When the south pole of the magnet enters the coil, the
magnetic flux also increases but in the opposite direction. The
induced current will now be generated in such a way that the
magnetic field of the coil will counteract this increase in magnetic
flux, resulting in the inductive voltage showing the opposite (negative).
Q3. Why is the signal produced by 1200-turn coil larger than that by 150-turn coil?
The inductive voltage value generated by the coil depends on a
number of factors, including the number of coil turns. Each turn in
the coil generates an induced voltage corresponding to the change
in magnetic flux. When there are more turns, the total induced
voltage will be the sum of the induced voltages of each turn. This
increases the overall voltage value. The fomula:
 Vinduced=−N∆(BA) ∆t
Q4: What is your comment for case you use the set of two
magnets for the measurement performed at step 7 and 8?
The value of voltage peak of set of two magnets is lower than the
value of voltage peak of one magnet.