electromagnetism

Measuring velocity by electromagnetic induction

Induction_velocity1This Studio project combined mechanics with electromagnetism. The e.m.f. induced in a set of vertically displaced coils as a magnet was thrown inside a cylindrical column was measured. The data was imported into a computer and speeds of the falling magnets were determined using two approaches. One was a naive approach determining speed from distance divide by transit time. The distance was the length of the coil. In a more accurate approach, however, we theoretically investigated the magnetic field due to a moving dipole inside a pickup coil. From this a mathematical model was derived which was fit onto experimentally determined curves, yielding accurate estimates of the velocities.Induction_velocity2

 

By Azeem Iqbal | Physics Studio
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Eddy current and Lenz’s law

An interesting demonstration of eddy current Plastic pipeis made by dropping a spherical or a cylindrical magnet down a copper pipe. The magnet does not fall as quickly as it falls due to gravity alone, showing the eddy currents induced in the copper pipe oppose the change in magnetic filed by creating opposing magnetic fields which slows the fall of the magnet.

Demonstration with:
Copper pipe

Plastic pipe

By Azeem Iqbal | Electricity and Magnetism
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Electromagnetic Induction and Working of Read-Write Operations in Magnetic Media

1. Provided apparatus

1. Provided apparatus

2. A Hall probe connected to the digital multimeter

2. A Hall probe connected to the digital multimeter

3. Voltage value shown by the multimeter when Hall probe is connected to the computer

3. Voltage value shown by the multimeter when Hall probe is connected to the computer

4. Attaching a disk magnet to the steel meter rule

4. Attaching a disk magnet to the steel meter rule

5. Hall sensor's flat face is perpendicular to the magnetic axis of the disk magnet

5. Hall sensor’s flat face is perpendicular to the magnetic axis of the disk magnet

6. Voltage measurement using Hall probe

6. Voltage measurement using Hall probe

7. Measuring the diameter of a disk magnet using vernier calliper

7. Measuring the diameter of a disk magnet using vernier calliper

8. All the M-files must be in the current directory of MATLAB

8. All the M-files must be in the current directory of MATLAB

9. Labview file for observing induced EMF and magnetic flux

9. Labview file for observing induced EMF and magnetic flux

10. Mounting a solenoid

10. Mounting a solenoid

11. Setup for observing induced EMF and magnetic flux using a solenoid

11. Setup for observing induced EMF and magnetic flux using a solenoid

12. Mounting a Hall probe with flat face perpendicular to the magnetic axis

12. Mounting a Hall probe with flat face perpendicular to the magnetic axis

13. Setup for observing magnetic field using a Hall probe

13. Setup for observing magnetic field using a Hall probe

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