Magnetic

From Physlab.lums.edu.pk
Jump to: navigation, search

Click here to go to list of experiments

Magnetic Phase Transitions of a Ferromagnetic Alloy (1.4)

Students Manual This innovative experiment entails the determination of the Curie point of a ferromagnetic alloy. An alternating current is passed through the alloy, (also used as a heating element in industrial furnaces). The alloy, at room temperature, is attracted towards a strong permanent magnet while the voltage, current and time are constantly monitored. As the alloy heats up, a point reaches where the alloy loses its magnetism and snaps away from the magnet. The Curie temperature is then determined from the current, voltage, time, surface area, length of the alloy and its emissivity. This experiment will be performed in the close supervision of the instructor, who will guide the students through the appropriate safety protocols.
Further Readings and References

"Determining the Cuire Temperature for Iron and Nickel", S. Velasco and F.L. Roman, The Physics Teacher 45, 387-389 (2007).
"Measurement of Curie Temperature for Gadolinium: A laboratory Experiment for Students", T. Lewowski and K. Wozniak, European Journal of Physics 18, 453-455 (1997).
"Finding the Cuire Temperature for Ferromagnetic Materials", K. Czestaw, S. Budzik , and C. Jozef, The Physics Teacher 45, 31-33, (2007).
"Finding the Cuire Temperature for Ferromagnetic Materials", K. Czestaw, S. Budzik , and C. Jozef, The Physics Teacher 45, 31-33, (2007).
"Simple Experiment to Help Students Understanding Magnetic Phenomena", Kerry Browne and David P. Jackson, The Physics Teacher 45, 425-429, (2007).
"Continuous Magnetization Patterns in Amorphous Ribbons", S. Rudolf and H. Giselher, IEEE Transactions on Magnetics 37, 2245-2247, (2001).

"Hysteresis in Light Bulb: Connecting Electricity with Thermodynamics with simple experiments and simulations", D A Clauss, R M Ralich and R D Ramsier, European Journal of Physics 22. 385-394. (2001).
Supporting Literature
for the Hardware
Resistance Heating Alloys and Systems for Industrial Furnaces

Pictotrial procedure (1.4)

1. Provided apparatus
1. Provided apparatus
2. Connecting a digital volteter to the variac
2. Connecting a digital volteter to the variac
3. Clamping a clamp meter to any one of the variac output lead
3. Clamping a clamp meter to any one of the variac output lead
4. Set the variac at 0V, switch on the mains supply and press green START button
4. Set the variac at 0V, switch on the mains supply and press green START button
5. Checking for current leakage in the control box
5. Checking for current leakage in the control box
6. Current leakage check in the pole
6. Current leakage check in the pole
7. Current leakage test in the variac
7. Current leakage test in the variac
8. Testing the emergency stop button
8. Testing the emergency stop button
9. Circuit breaker check
9. Circuit breaker check
10. Set variac at 22V. The operating voltage range lies between 22-30V
10. Set variac at 22V. The operating voltage range lies between 22-30V
11. Kanthal wire attached to the magnet
11. Kanthal wire attached to the magnet
12. Kanthal wire snapped away
12. Kanthal wire snapped away
Personal tools