an electrical current flows through a conductor, a magnetic field will always
be created around the conductor. This process of forming a magnetic field is
called electromagnetism. Magnetic field lines can be considered as a magnetic
force field. Thus, any magnetic materials in the immediate vicinity of this
field will experience a magnetic force acting on it.
Use a ferromagnetic or steel material (nail) for the core and wrap copper wire around it, making about 30-100 turns. Make sure that the insulation is removed at both ends of the copper wire, and connect it to an AC voltage source. Place the clips next to the electromagnet to see if they have any kind of attraction force.
(2) Build the circuit shown below.
(3) Count the number of turns (N)
that make up the coil, and measure the current flowing through it. Place the
clips next to the electromagnet, calculate how many clips are attracted to it
(find the mass of the clips using electronic scales). Repeat this process 6
times, increasing the current for each new measurement, maintaining a constant
(N). Write down the values in the table below.
the above, but this time keep the current constant and change the number of
turns of the coil (N).
(5) Measure the length of the coil (L) with a ruler.
(6) Calculate the coil cross-sectional area
(7) Record all your data in the table below.
(8) Build dependency graphs (1) Force F (Y axis) / Current I (X axis) (2) Force F (Y axis) / number of turns N (X axis)
Number of screws
The mass scrap
Cross sectional area
(9) Using force and P= F, determine the mean value of the
magnetic constant µ
Mean value µ